56121018 has 16 divisors (see below), whose sum is σ = 112916160. Its totient is φ = 18594656.

The previous prime is 56121017. The next prime is 56121053. The reversal of 56121018 is 81012165.

It is a super-2 number, since 2×56121018² = 6299137322712648, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (56121017) 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, 27003 + ... + 29006.

It is an arithmetic number, because the mean of its divisors is an integer number (7057260).

Almost surely, 2^56121018 is an apocalyptic number.

56121018 is an abundant number, since it is smaller than the sum of its proper divisors (56795142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56121018 is a wasteful number, since it uses less digits than its factorization.

56121018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56181.

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 56121018 is about 7491.3962650497. The cubic root of 56121018 is about 382.8616324432.

The spelling of 56121018 in words is "fifty-six million, one hundred twenty-one thousand, eighteen".