21238171932 has 24 divisors (see below), whose sum is σ = 50036861056. Its totient is φ = 7010658288.

The previous prime is 21238171921. The next prime is 21238171949. The reversal of 21238171932 is 23917183212.

It is a super-2 number, since 2×21238171932² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8590258 + ... + 8592729.

Almost surely, 2^21238171932 is an apocalyptic number.

It is an amenable number.

21238171932 is an abundant number, since it is smaller than the sum of its proper divisors (28798689124).

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

21238171932 is a wasteful number, since it uses less digits than its factorization.

21238171932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17183097 (or 17183095 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The spelling of 21238171932 in words is "twenty-one billion, two hundred thirty-eight million, one hundred seventy-one thousand, nine hundred thirty-two".