121218507 has 12 divisors (see below), whose sum is σ = 175389760. Its totient is φ = 80675568.

The previous prime is 121218491. The next prime is 121218511. The reversal of 121218507 is 705812121.

It is not a de Polignac number, because 121218507 - 2⁴ = 121218491 is a prime.

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 (121218557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5632 + ... + 16557.

Almost surely, 2^121218507 is an apocalyptic number.

121218507 is a deficient number, since it is larger than the sum of its proper divisors (54171253).

121218507 is a wasteful number, since it uses less digits than its factorization.

121218507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22802 (or 22799 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 121218507 is about 11009.9276564381. The cubic root of 121218507 is about 494.9062938629.

The spelling of 121218507 in words is "one hundred twenty-one million, two hundred eighteen thousand, five hundred seven".