21355462535620 has 12 divisors (see below), whose sum is σ = 44846471324844. Its totient is φ = 8542185014240.

The previous prime is 21355462535569. The next prime is 21355462535623. The reversal of 21355462535620 is 2653526455312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2832630373764 + 18522832161856 = 1683042^2 + 4303816^2 .

It is a super-2 number, since 2×21355462535620² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21355462535623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533886563371 + ... + 533886563410.

It is an arithmetic number, because the mean of its divisors is an integer number (3737205943737).

Almost surely, 2^{21355462535620} is an apocalyptic number.

21355462535620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21355462535620 is an abundant number, since it is smaller than the sum of its proper divisors (23491008789224).

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

21355462535620 is a wasteful number, since it uses less digits than its factorization.

21355462535620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067773126790 (or 1067773126788 counting only the distinct ones).

The product of its (nonzero) digits is 6480000, while the sum is 49.

The spelling of 21355462535620 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred sixty-two million, five hundred thirty-five thousand, six hundred twenty".