121277045644 has 24 divisors (see below), whose sum is σ = 221698941408. Its totient is φ = 57940122240.

The previous prime is 121277045623. The next prime is 121277045647. The reversal of 121277045644 is 446540772121.

It is a self number, because there is not a number n which added to its sum of digits gives 121277045644.

It is not an unprimeable number, because it can be changed into a prime (121277045647) 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, 617227 + ... + 789634.

It is an arithmetic number, because the mean of its divisors is an integer number (9237455892).

Almost surely, 2^121277045644 is an apocalyptic number.

It is an amenable number.

121277045644 is a deficient number, since it is larger than the sum of its proper divisors (100421895764).

121277045644 is a wasteful number, since it uses less digits than its factorization.

121277045644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407825 (or 1407823 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 43.

The spelling of 121277045644 in words is "one hundred twenty-one billion, two hundred seventy-seven million, forty-five thousand, six hundred forty-four".