21431311132 has 48 divisors (see below), whose sum is σ = 46770474240. Its totient is φ = 8347852800.

The previous prime is 21431311129. The next prime is 21431311201. The reversal of 21431311132 is 23111313412.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2361219 + ... + 2370277.

It is an arithmetic number, because the mean of its divisors is an integer number (974384880).

Almost surely, 2^21431311132 is an apocalyptic number.

21431311132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21431311132 is an abundant number, since it is smaller than the sum of its proper divisors (25339163108).

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

21431311132 is a wasteful number, since it uses less digits than its factorization.

21431311132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16762 (or 16760 counting only the distinct ones).

The product of its digits is 432, while the sum is 22.

Adding to 21431311132 its reverse (23111313412), we get a palindrome (44542624544).

The spelling of 21431311132 in words is "twenty-one billion, four hundred thirty-one million, three hundred eleven thousand, one hundred thirty-two".