21213131082 has 32 divisors (see below), whose sum is σ = 49843442880. Its totient is φ = 5933742720.

The previous prime is 21213131057. The next prime is 21213131083. The reversal of 21213131082 is 28013131212.

It is a super-2 number, since 2×21213131082² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21213131083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12361107 + ... + 12362822.

It is an arithmetic number, because the mean of its divisors is an integer number (1557607590).

Almost surely, 2^21213131082 is an apocalyptic number.

21213131082 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21213131082 is an abundant number, since it is smaller than the sum of its proper divisors (28630311798).

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

21213131082 is a wasteful number, since it uses less digits than its factorization.

21213131082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24723958.

The product of its (nonzero) digits is 576, while the sum is 24.

Adding to 21213131082 its reverse (28013131212), we get a palindrome (49226262294).

The spelling of 21213131082 in words is "twenty-one billion, two hundred thirteen million, one hundred thirty-one thousand, eighty-two".