19921754910 has 32 divisors (see below), whose sum is σ = 47818242432. Its totient is φ = 5311797920.

The previous prime is 19921754891. The next prime is 19921754947. The reversal of 19921754910 is 1945712991.

It is a self number, because there is not a number n which added to its sum of digits gives 19921754910.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228565 + ... + 303455.

It is an arithmetic number, because the mean of its divisors is an integer number (1494320076).

Almost surely, 2^19921754910 is an apocalyptic number.

19921754910 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19921754910 is an abundant number, since it is smaller than the sum of its proper divisors (27896487522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19921754910 is a wasteful number, since it uses less digits than its factorization.

19921754910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83768.

The product of its (nonzero) digits is 204120, while the sum is 48.

The spelling of 19921754910 in words is "nineteen billion, nine hundred twenty-one million, seven hundred fifty-four thousand, nine hundred ten".