121256818 has 16 divisors (see below), whose sum is σ = 197065440. Its totient is φ = 55734336.

The previous prime is 121256809. The next prime is 121256819. The reversal of 121256818 is 818652121.

It is a super-2 number, since 2×121256818² = 29406431822970248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (121256819) 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, 40008 + ... + 42931.

It is an arithmetic number, because the mean of its divisors is an integer number (12316590).

Almost surely, 2^121256818 is an apocalyptic number.

121256818 is a deficient number, since it is larger than the sum of its proper divisors (75808622).

121256818 is a wasteful number, since it uses less digits than its factorization.

121256818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83001.

The product of its digits is 7680, while the sum is 34.

The square root of 121256818 is about 11011.6673578528. The cubic root of 121256818 is about 494.9584266007.

The spelling of 121256818 in words is "one hundred twenty-one million, two hundred fifty-six thousand, eight hundred eighteen".