21253365566320 has 40 divisors (see below), whose sum is σ = 49415797789200. Its totient is φ = 8501049822720.

The previous prime is 21253365566309. The next prime is 21253365566333. The reversal of 21253365566320 is 2366556335212.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2315245 + ... + 6918604.

It is an arithmetic number, because the mean of its divisors is an integer number (1235394944730).

Almost surely, 2^{21253365566320} is an apocalyptic number.

21253365566320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21253365566320 is an abundant number, since it is smaller than the sum of its proper divisors (28162432222880).

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

21253365566320 is a wasteful number, since it uses less digits than its factorization.

21253365566320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9262633 (or 9262627 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 49.

The spelling of 21253365566320 in words is "twenty-one trillion, two hundred fifty-three billion, three hundred sixty-five million, five hundred sixty-six thousand, three hundred twenty".