21055326980940 has 768 divisors, whose sum is σ = 80082100224000. Its totient is φ = 4485649674240.

The previous prime is 21055326980881. The next prime is 21055326980983. The reversal of 21055326980940 is 4908962355012.

21055326980940 is a `hidden beast` number, since 2 + 1 + 0 + 5 + 532 + 69 + 8 + 0 + 9 + 40 = 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 (19) of ones.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 2564903556 + ... + 2564911764.

It is an arithmetic number, because the mean of its divisors is an integer number (104273568000).

Almost surely, 2^{21055326980940} is an apocalyptic number.

21055326980940 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 21055326980940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40041050112000).

21055326980940 is an abundant number, since it is smaller than the sum of its proper divisors (59026773243060).

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

21055326980940 is a wasteful number, since it uses less digits than its factorization.

21055326980940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8827 (or 8819 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 54.

The spelling of 21055326980940 in words is "twenty-one trillion, fifty-five billion, three hundred twenty-six million, nine hundred eighty thousand, nine hundred forty".