21019910926 has 12 divisors (see below), whose sum is σ = 36677599848. Its totient is φ = 9008533212.

The previous prime is 21019910903. The next prime is 21019910939. The reversal of 21019910926 is 62901991012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 107244346 + ... + 107244541.

It is an arithmetic number, because the mean of its divisors is an integer number (3056466654).

Almost surely, 2^21019910926 is an apocalyptic number.

21019910926 is a deficient number, since it is larger than the sum of its proper divisors (15657688922).

21019910926 is a wasteful number, since it uses less digits than its factorization.

21019910926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214488903 (or 214488896 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 40.

The spelling of 21019910926 in words is "twenty-one billion, nineteen million, nine hundred ten thousand, nine hundred twenty-six".