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20101212121 = 379162132719
BaseRepresentation
bin10010101110001000…
…000010011111011001
31220212212222101011211
4102232020002133121
5312131402241441
613122342423121
71311061324654
oct225610023731
956785871154
1020101212121
118585679201
123a8ba31aa1
131b84654073
14d8991089b
157c9aaea81
hex4ae2027d9

20101212121 has 8 divisors (see below), whose sum is σ = 20167299200. Its totient is φ = 20035194480.

The previous prime is 20101212119. The next prime is 20101212137. The reversal of 20101212121 is 12121210102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20101212121 - 21 = 20101212119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20101212191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 598000 + ... + 630718.

It is an arithmetic number, because the mean of its divisors is an integer number (2520912400).

Almost surely, 220101212121 is an apocalyptic number.

It is an amenable number.

20101212121 is a deficient number, since it is larger than the sum of its proper divisors (66087079).

20101212121 is a wasteful number, since it uses less digits than its factorization.

20101212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34719.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20101212121 its reverse (12121210102), we get a palindrome (32222422223).

The spelling of 20101212121 in words is "twenty billion, one hundred one million, two hundred twelve thousand, one hundred twenty-one".

Divisors: 1 379 1621 32719 614359 12400501 53037499 20101212121