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121132021 = 177125413
BaseRepresentation
bin1110011100001…
…01001111110101
322102221010220011
413032011033311
5222002211041
620004140221
73000414403
oct716051765
9272833804
10121132021
116241530a
1234697671
131c13226a
1412132473
15a97ae81
hex73853f5

121132021 has 4 divisors (see below), whose sum is σ = 128257452. Its totient is φ = 114006592.

The previous prime is 121132003. The next prime is 121132051. The reversal of 121132021 is 120231121.

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 75082225 + 46049796 = 8665^2 + 6786^2 .

It is a cyclic number.

It is not a de Polignac number, because 121132021 - 221 = 119034869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121131992 and 121132010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121132001) 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, 3562690 + ... + 3562723.

It is an arithmetic number, because the mean of its divisors is an integer number (32064363).

Almost surely, 2121132021 is an apocalyptic number.

It is an amenable number.

121132021 is a deficient number, since it is larger than the sum of its proper divisors (7125431).

121132021 is an equidigital number, since it uses as much as digits as its factorization.

121132021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7125430.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 121132021 is about 11005.9993185535. Note that the first 3 decimals coincide. The cubic root of 121132021 is about 494.7885652798.

Adding to 121132021 its reverse (120231121), we get a palindrome (241363142).

The spelling of 121132021 in words is "one hundred twenty-one million, one hundred thirty-two thousand, twenty-one".

Divisors: 1 17 7125413 121132021