21152206400320 has 112 divisors (see below), whose sum is σ = 54254075010048. Its totient is φ = 7831952916480.

The previous prime is 21152206400243. The next prime is 21152206400341. The reversal of 21152206400320 is 2300460225112.

It is a super-2 number, since 2×21152206400320² (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 15 ways as a sum of consecutive naturals, for example, 46125729 + ... + 46582048.

Almost surely, 2^{21152206400320} is an apocalyptic number.

21152206400320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21152206400320 is an abundant number, since it is smaller than the sum of its proper divisors (33101868609728).

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

21152206400320 is a wasteful number, since it uses less digits than its factorization.

21152206400320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92707848 (or 92707838 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 21152206400320 its reverse (2300460225112), we get a palindrome (23452666625432).

The spelling of 21152206400320 in words is "twenty-one trillion, one hundred fifty-two billion, two hundred six million, four hundred thousand, three hundred twenty".