19976424621 has 16 divisors (see below), whose sum is σ = 26846138880. Its totient is φ = 13212221360.

The previous prime is 19976424571. The next prime is 19976424679. The reversal of 19976424621 is 12642467991.

It is a cyclic number.

It is not a de Polignac number, because 19976424621 - 2⁷ = 19976424493 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19976424121) 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, 2480920 + ... + 2488958.

It is an arithmetic number, because the mean of its divisors is an integer number (1677883680).

Almost surely, 2^19976424621 is an apocalyptic number.

It is an amenable number.

19976424621 is a deficient number, since it is larger than the sum of its proper divisors (6869714259).

19976424621 is a wasteful number, since it uses less digits than its factorization.

19976424621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14496.

The product of its digits is 1306368, while the sum is 51.

The spelling of 19976424621 in words is "nineteen billion, nine hundred seventy-six million, four hundred twenty-four thousand, six hundred twenty-one".