113551021 has 2 divisors, whose sum is σ = 113551022. Its totient is φ = 113551020.

The previous prime is 113551019. The next prime is 113551043. The reversal of 113551021 is 120155311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69806025 + 43744996 = 8355^2 + 6614^2 .

It is a cyclic number.

It is not a de Polignac number, because 113551021 - 2¹ = 113551019 is a prime.

Together with 113551019, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 113551021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113551121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56775510 + 56775511.

It is an arithmetic number, because the mean of its divisors is an integer number (56775511).

Almost surely, 2^113551021 is an apocalyptic number.

It is an amenable number.

113551021 is a deficient number, since it is larger than the sum of its proper divisors (1).

113551021 is an equidigital number, since it uses as much as digits as its factorization.

113551021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 113551021 is about 10656.0321414680. The cubic root of 113551021 is about 484.2433676360.

The spelling of 113551021 in words is "one hundred thirteen million, five hundred fifty-one thousand, twenty-one".