21131001032 has 64 divisors (see below), whose sum is σ = 42513130800. Its totient is φ = 9826790400.

The previous prime is 21131000939. The next prime is 21131001041. The reversal of 21131001032 is 23010013112.

It can be written as a sum of positive squares in 8 ways, for example, as 18693999076 + 2437001956 = 136726^2 + 49366^2 .

It is a super-2 number, since 2×21131001032² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21131000998 and 21131001016.

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 15 ways as a sum of consecutive naturals, for example, 854798 + ... + 879170.

Almost surely, 2^21131001032 is an apocalyptic number.

It is an amenable number.

21131001032 is an abundant number, since it is smaller than the sum of its proper divisors (21382129768).

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

21131001032 is a wasteful number, since it uses less digits than its factorization.

21131001032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24546 (or 24542 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21131001032 its reverse (23010013112), we get a palindrome (44141014144).

The spelling of 21131001032 in words is "twenty-one billion, one hundred thirty-one million, one thousand, thirty-two".