21922814306420 has 12 divisors (see below), whose sum is σ = 46037910043524. Its totient is φ = 8769125722560.

The previous prime is 21922814306399. The next prime is 21922814306429. The reversal of 21922814306420 is 2460341822912.

It can be written as a sum of positive squares in 2 ways, for example, as 5293284909796 + 16629529396624 = 2300714^2 + 4077932^2 .

It is a super-2 number, since 2×21922814306420² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21922814306429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 548070357641 + ... + 548070357680.

It is an arithmetic number, because the mean of its divisors is an integer number (3836492503627).

Almost surely, 2^{21922814306420} is an apocalyptic number.

21922814306420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21922814306420 is an abundant number, since it is smaller than the sum of its proper divisors (24115095737104).

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

21922814306420 is a wasteful number, since it uses less digits than its factorization.

21922814306420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096140715330 (or 1096140715328 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 44.

The spelling of 21922814306420 in words is "twenty-one trillion, nine hundred twenty-two billion, eight hundred fourteen million, three hundred six thousand, four hundred twenty".