2121664623436 has 48 divisors (see below), whose sum is σ = 3870923696640. Its totient is φ = 1016260132160.

The previous prime is 2121664623433. The next prime is 2121664623469. The reversal of 2121664623436 is 6343264661212.

It is a happy number.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2121664623433) 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, 161177391 + ... + 161190553.

It is an arithmetic number, because the mean of its divisors is an integer number (80644243680).

Almost surely, 2^{2121664623436} is an apocalyptic number.

It is an amenable number.

2121664623436 is a deficient number, since it is larger than the sum of its proper divisors (1749259073204).

2121664623436 is a wasteful number, since it uses less digits than its factorization.

2121664623436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23934 (or 23932 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 46.

The spelling of 2121664623436 in words is "two trillion, one hundred twenty-one billion, six hundred sixty-four million, six hundred twenty-three thousand, four hundred thirty-six".