21364172020476 has 192 divisors, whose sum is σ = 57128604825600. Its totient is φ = 6901495840512.

The previous prime is 21364172020463. The next prime is 21364172020507. The reversal of 21364172020476 is 67402027146312.

21364172020476 is a `hidden beast` number, since 2 + 1 + 3 + 6 + 4 + 172 + 0 + 2 + 0 + 476 = 666.

It is a super-2 number, since 2×21364172020476² (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 63 ways as a sum of consecutive naturals, for example, 156672141 + ... + 156808443.

It is an arithmetic number, because the mean of its divisors is an integer number (297544816800).

Almost surely, 2^{21364172020476} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21364172020476, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28564302412800).

21364172020476 is an abundant number, since it is smaller than the sum of its proper divisors (35764432805124).

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

21364172020476 is a wasteful number, since it uses less digits than its factorization.

21364172020476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136705 (or 136697 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

Adding to 21364172020476 its reverse (67402027146312), we get a palindrome (88766199166788).

The spelling of 21364172020476 in words is "twenty-one trillion, three hundred sixty-four billion, one hundred seventy-two million, twenty thousand, four hundred seventy-six".