21835139928 has 32 divisors (see below), whose sum is σ = 62386114560. Its totient is φ = 6238611360.

The previous prime is 21835139927. The next prime is 21835139941. The reversal of 21835139928 is 82993153812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21835139927) 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, 64985368 + ... + 64985703.

It is an arithmetic number, because the mean of its divisors is an integer number (1949566080).

Almost surely, 2^21835139928 is an apocalyptic number.

21835139928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21835139928 is an abundant number, since it is smaller than the sum of its proper divisors (40550974632).

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

21835139928 is a wasteful number, since it uses less digits than its factorization.

21835139928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129971087 (or 129971083 counting only the distinct ones).

The product of its digits is 933120, while the sum is 51.

The spelling of 21835139928 in words is "twenty-one billion, eight hundred thirty-five million, one hundred thirty-nine thousand, nine hundred twenty-eight".