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20133131321 = 51797388693
BaseRepresentation
bin10010110000000001…
…110011010000111001
31220222010001001002102
4102300001303100321
5312213040200241
613125442513145
71311626535602
oct226001632071
956863031072
1020133131321
1185a169a606
123a9a6657b5
131b8b14b774
14d8dc5cda9
157cc7b739b
hex4b0073439

20133131321 has 4 divisors (see below), whose sum is σ = 20133571812. Its totient is φ = 20132690832.

The previous prime is 20133131281. The next prime is 20133131353. The reversal of 20133131321 is 12313133102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1483405225 + 18649726096 = 38515^2 + 136564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-20133131321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20133131293 and 20133131302.

It is not an unprimeable number, because it can be changed into a prime (20133131521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142550 + ... + 246143.

It is an arithmetic number, because the mean of its divisors is an integer number (5033392953).

Almost surely, 220133131321 is an apocalyptic number.

It is an amenable number.

20133131321 is a deficient number, since it is larger than the sum of its proper divisors (440491).

20133131321 is an equidigital number, since it uses as much as digits as its factorization.

20133131321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440490.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 20133131321 its reverse (12313133102), we get a palindrome (32446264423).

The spelling of 20133131321 in words is "twenty billion, one hundred thirty-three million, one hundred thirty-one thousand, three hundred twenty-one".

Divisors: 1 51797 388693 20133131321