121256652121 has 16 divisors (see below), whose sum is σ = 139307279040. Its totient is φ = 104382673920.

The previous prime is 121256652107. The next prime is 121256652217.

121256652121 is nontrivially palindromic in base 10.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121256652121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121256652221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 315241 + ... + 584713.

It is an arithmetic number, because the mean of its divisors is an integer number (8706704940).

Almost surely, 2^121256652121 is an apocalyptic number.

121256652121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121256652121 is a deficient number, since it is larger than the sum of its proper divisors (18050626919).

121256652121 is a wasteful number, since it uses less digits than its factorization.

121256652121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271656.

The product of its digits is 14400, while the sum is 34.

It can be divided in two parts, 121256 and 652121, that added together give a palindrome (773377).

The spelling of 121256652121 in words is "one hundred twenty-one billion, two hundred fifty-six million, six hundred fifty-two thousand, one hundred twenty-one".