12121220961 has 12 divisors (see below), whose sum is σ = 18269666688. Its totient is φ = 7729474104.

The previous prime is 12121220941. The next prime is 12121220963. The reversal of 12121220961 is 16902212121.

It is not a de Polignac number, because 12121220961 - 2¹⁰ = 12121219937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12121220963) 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, 29278105 + ... + 29278518.

It is an arithmetic number, because the mean of its divisors is an integer number (1522472224).

Almost surely, 2^12121220961 is an apocalyptic number.

It is an amenable number.

12121220961 is a deficient number, since it is larger than the sum of its proper divisors (6148445727).

12121220961 is a wasteful number, since it uses less digits than its factorization.

12121220961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58556652 (or 58556649 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The spelling of 12121220961 in words is "twelve billion, one hundred twenty-one million, two hundred twenty thousand, nine hundred sixty-one".