21039822660780 has 384 divisors, whose sum is σ = 81625369835520. Its totient is φ = 4371034752000.

The previous prime is 21039822660761. The next prime is 21039822660833. The reversal of 21039822660780 is 8706622893012.

21039822660780 is a `hidden beast` number, since 2 + 1 + 0 + 3 + 9 + 8 + 2 + 26 + 607 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 218704290 + ... + 218800470.

It is an arithmetic number, because the mean of its divisors is an integer number (212566067280).

Almost surely, 2^{21039822660780} is an apocalyptic number.

21039822660780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21039822660780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40812684917760).

21039822660780 is an abundant number, since it is smaller than the sum of its proper divisors (60585547174740).

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

21039822660780 is a wasteful number, since it uses less digits than its factorization.

21039822660780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101478 (or 101470 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The spelling of 21039822660780 in words is "twenty-one trillion, thirty-nine billion, eight hundred twenty-two million, six hundred sixty thousand, seven hundred eighty".