21994064765400 has 384 divisors, whose sum is σ = 85628394432000. Its totient is φ = 4640505408000.

The previous prime is 21994064765377. The next prime is 21994064765429. The reversal of 21994064765400 is 456746049912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1435026 + ... + 6785825.

It is an arithmetic number, because the mean of its divisors is an integer number (222990610500).

Almost surely, 2^{21994064765400} is an apocalyptic number.

21994064765400 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 21994064765400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42814197216000).

21994064765400 is an abundant number, since it is smaller than the sum of its proper divisors (63634329666600).

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

21994064765400 is a wasteful number, since it uses less digits than its factorization.

21994064765400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8220904 (or 8220881 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 57.

The spelling of 21994064765400 in words is "twenty-one trillion, nine hundred ninety-four billion, sixty-four million, seven hundred sixty-five thousand, four hundred".