21231222311020 has 48 divisors (see below), whose sum is σ = 47210033122560. Its totient is φ = 7992628383744.

The previous prime is 21231222310997. The next prime is 21231222311059. The reversal of 21231222311020 is 2011322213212.

It is a super-2 number, since 2×21231222311020² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21231222310982 and 21231222311000.

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, 7922821 + ... + 10258339.

It is an arithmetic number, because the mean of its divisors is an integer number (983542356720).

Almost surely, 2^{21231222311020} is an apocalyptic number.

21231222311020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21231222311020 is an abundant number, since it is smaller than the sum of its proper divisors (25978810811540).

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

21231222311020 is a wasteful number, since it uses less digits than its factorization.

21231222311020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2362282 (or 2362280 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21231222311020 its reverse (2011322213212), we get a palindrome (23242544524232).

The spelling of 21231222311020 in words is "twenty-one trillion, two hundred thirty-one billion, two hundred twenty-two million, three hundred eleven thousand, twenty".