21232223920 has 40 divisors (see below), whose sum is σ = 50568950880. Its totient is φ = 8285744640.

The previous prime is 21232223891. The next prime is 21232223951. The reversal of 21232223920 is 2932223212.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3233340 + ... + 3239899.

It is an arithmetic number, because the mean of its divisors is an integer number (1264223772).

Almost surely, 2^21232223920 is an apocalyptic number.

21232223920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21232223920 is an abundant number, since it is smaller than the sum of its proper divisors (29336726960).

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

21232223920 is a wasteful number, since it uses less digits than its factorization.

21232223920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6473293 (or 6473287 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The spelling of 21232223920 in words is "twenty-one billion, two hundred thirty-two million, two hundred twenty-three thousand, nine hundred twenty".