21994449150976 has 297 divisors, whose sum is σ = 48209214954369. Its totient is φ = 10027368972288.

The previous prime is 21994449150953. The next prime is 21994449150983. The reversal of 21994449150976 is 67905194449912.

The square root of 21994449150976 is 4689824.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 2625436902400 + 19369012248576 = 1620320^2 + 4401024^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 94396777356 + ... + 94396777588.

Almost surely, 2^{21994449150976} is an apocalyptic number.

21994449150976 is the 4689824-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21994449150976

21994449150976 is an abundant number, since it is smaller than the sum of its proper divisors (26214765803393).

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

21994449150976 is an frugal number, since it uses more digits than its factorization.

21994449150976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 176359680, while the sum is 70.

The spelling of 21994449150976 in words is "twenty-one trillion, nine hundred ninety-four billion, four hundred forty-nine million, one hundred fifty thousand, nine hundred seventy-six".