21025023453320 has 32 divisors (see below), whose sum is σ = 47306864208600. Its totient is φ = 8409909570048.

The previous prime is 21025023453299. The next prime is 21025023453323. The reversal of 21025023453320 is 2335432052012.

It can be written as a sum of positive squares in 4 ways, for example, as 16496545820836 + 4528477632484 = 4061594^2 + 2128022^2 .

It is a super-2 number, since 2×21025023453320² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21025023453323) 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, 340772 + ... + 6493548.

Almost surely, 2^{21025023453320} is an apocalyptic number.

21025023453320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21025023453320 is an abundant number, since it is smaller than the sum of its proper divisors (26281840755280).

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

21025023453320 is a wasteful number, since it uses less digits than its factorization.

21025023453320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6238217 (or 6238213 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 32.

The spelling of 21025023453320 in words is "twenty-one trillion, twenty-five billion, twenty-three million, four hundred fifty-three thousand, three hundred twenty".