21121526665422 has 80 divisors (see below), whose sum is σ = 47704703473152. Its totient is φ = 6984460042560.

The previous prime is 21121526665411. The next prime is 21121526665441. The reversal of 21121526665422 is 22456662512112.

It is a super-2 number, since 2×21121526665422² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 276085408 + ... + 276161900.

Almost surely, 2^{21121526665422} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21121526665422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23852351736576).

21121526665422 is an abundant number, since it is smaller than the sum of its proper divisors (26583176807730).

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

21121526665422 is a wasteful number, since it uses less digits than its factorization.

21121526665422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90055 (or 90046 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The spelling of 21121526665422 in words is "twenty-one trillion, one hundred twenty-one billion, five hundred twenty-six million, six hundred sixty-five thousand, four hundred twenty-two".