21870258408560 has 40 divisors (see below), whose sum is σ = 50849397446640. Its totient is φ = 8747923295232.

The previous prime is 21870258408553. The next prime is 21870258408613. The reversal of 21870258408560 is 6580485207812.

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

It is a super-3 number, since 3×21870258408560³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21870258408496 and 21870258408505.

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, 1131659 + ... + 6709781.

It is an arithmetic number, because the mean of its divisors is an integer number (1271234936166).

Almost surely, 2^{21870258408560} is an apocalyptic number.

21870258408560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21870258408560 is an abundant number, since it is smaller than the sum of its proper divisors (28979139038080).

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

21870258408560 is a wasteful number, since it uses less digits than its factorization.

21870258408560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5627145 (or 5627139 counting only the distinct ones).

The product of its (nonzero) digits is 8601600, while the sum is 56.

The spelling of 21870258408560 in words is "twenty-one trillion, eight hundred seventy billion, two hundred fifty-eight million, four hundred eight thousand, five hundred sixty".