121286521416256 has 63 divisors (see below), whose sum is σ = 279973722275337. Its totient is φ = 51979673437440.

The previous prime is 121286521416227. The next prime is 121286521416341. The reversal of 121286521416256 is 652614125682121.

The square root of 121286521416256 is 11013016.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 61061471585856 + 60225049830400 = 7814184^2 + 7760480^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 616630566 + ... + 616827226.

Almost surely, 2^{121286521416256} is an apocalyptic number.

121286521416256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

121286521416256 is the 11013016-th square number.

It is an amenable number.

121286521416256 is an abundant number, since it is smaller than the sum of its proper divisors (158687200859081).

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

121286521416256 is an frugal number, since it uses more digits than its factorization.

121286521416256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393348 (or 196670 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 52.

The spelling of 121286521416256 in words is "one hundred twenty-one trillion, two hundred eighty-six billion, five hundred twenty-one million, four hundred sixteen thousand, two hundred fifty-six".