21012031031222 has 256 divisors, whose sum is σ = 43609460244480. Its totient is φ = 7345104537600.

The previous prime is 21012031031219. The next prime is 21012031031231. The reversal of 21012031031222 is 22213013021012.

It is a junction number, because it is equal to n+sod(n) for n = 21012031031194 and 21012031031203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 773084429 + ... + 773111607.

It is an arithmetic number, because the mean of its divisors is an integer number (170349454080).

Almost surely, 2^{21012031031222} is an apocalyptic number.

21012031031222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21012031031222 is an abundant number, since it is smaller than the sum of its proper divisors (22597429213258).

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

21012031031222 is a wasteful number, since it uses less digits than its factorization.

21012031031222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27427.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21012031031222 its reverse (22213013021012), we get a palindrome (43225044052234).

The spelling of 21012031031222 in words is "twenty-one trillion, twelve billion, thirty-one million, thirty-one thousand, two hundred twenty-two".