21353505632416 has 48 divisors (see below), whose sum is σ = 43399083087360. Its totient is φ = 10331567850240.

The previous prime is 21353505632321. The next prime is 21353505632419. The reversal of 21353505632416 is 61423650535312.

It is a super-2 number, since 2×21353505632416² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21353505632419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12562165 + ... + 14160331.

It is an arithmetic number, because the mean of its divisors is an integer number (904147564320).

Almost surely, 2^{21353505632416} is an apocalyptic number.

It is an amenable number.

21353505632416 is an abundant number, since it is smaller than the sum of its proper divisors (22045577454944).

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

21353505632416 is a wasteful number, since it uses less digits than its factorization.

21353505632416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1611677 (or 1611669 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 46.

The spelling of 21353505632416 in words is "twenty-one trillion, three hundred fifty-three billion, five hundred five million, six hundred thirty-two thousand, four hundred sixteen".