21022312031220 has 96 divisors (see below), whose sum is σ = 59679270185472. Its totient is φ = 5528186661888.

The previous prime is 21022312031177. The next prime is 21022312031221. The reversal of 21022312031220 is 2213021322012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022312031221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24736474 + ... + 25572206.

It is an arithmetic number, because the mean of its divisors is an integer number (621659064432).

Almost surely, 2^{21022312031220} is an apocalyptic number.

21022312031220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21022312031220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29839635092736).

21022312031220 is an abundant number, since it is smaller than the sum of its proper divisors (38656958154252).

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

21022312031220 is a wasteful number, since it uses less digits than its factorization.

21022312031220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841561 (or 841559 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21022312031220 its reverse (2213021322012), we get a palindrome (23235333353232).

The spelling of 21022312031220 in words is "twenty-one trillion, twenty-two billion, three hundred twelve million, thirty-one thousand, two hundred twenty".