121056521 has 4 divisors (see below), whose sum is σ = 126319872. Its totient is φ = 115793172.

The previous prime is 121056517. The next prime is 121056569. The reversal of 121056521 is 125650121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121056521 - 2² = 121056517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 5263327 = 121056521 / (1 + 2 + 1 + 0 + 5 + 6 + 5 + 2 + 1).

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121056571) 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, 2631641 + ... + 2631686.

It is an arithmetic number, because the mean of its divisors is an integer number (31579968).

Almost surely, 2^121056521 is an apocalyptic number.

It is an amenable number.

121056521 is a deficient number, since it is larger than the sum of its proper divisors (5263351).

121056521 is an equidigital number, since it uses as much as digits as its factorization.

121056521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5263350.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 121056521 is about 11002.5688364127. The cubic root of 121056521 is about 494.6857455070.

The spelling of 121056521 in words is "one hundred twenty-one million, fifty-six thousand, five hundred twenty-one".