21477620996370 has 576 divisors, whose sum is σ = 73193924643840. Its totient is φ = 4435433354880.

The previous prime is 21477620996369. The next prime is 21477620996389. The reversal of 21477620996370 is 7369902677412.

21477620996370 is a `hidden beast` number, since 2 + 1 + 477 + 6 + 2 + 0 + 9 + 96 + 3 + 70 = 666.

It is a super-2 number, since 2×21477620996370² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 21477620996298 and 21477620996307.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 335456221 + ... + 335520239.

It is an arithmetic number, because the mean of its divisors is an integer number (127072785840).

Almost surely, 2^{21477620996370} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21477620996370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36596962321920).

21477620996370 is an abundant number, since it is smaller than the sum of its proper divisors (51716303647470).

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

21477620996370 is a wasteful number, since it uses less digits than its factorization.

21477620996370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64233 (or 64210 counting only the distinct ones).

The product of its (nonzero) digits is 48009024, while the sum is 63.

The spelling of 21477620996370 in words is "twenty-one trillion, four hundred seventy-seven billion, six hundred twenty million, nine hundred ninety-six thousand, three hundred seventy".