21976490792281 has 9 divisors (see below), whose sum is σ = 22026431584573. Its totient is φ = 21926663007520.

The previous prime is 21976490792273. The next prime is 21976490792297. The reversal of 21976490792281 is 18229709467912.

The square root of 21976490792281 is 4687909.

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

It can be written as a sum of positive squares in 4 ways, for example, as 2489740007881 + 19486750784400 = 1577891^2 + 4414380^2 .

It is not a de Polignac number, because 21976490792281 - 2³ = 21976490792273 is a prime.

It is a super-2 number, since 2×21976490792281² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21976490793281) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2161120965 + ... + 2161131133.

Almost surely, 2^{21976490792281} is an apocalyptic number.

21976490792281 is the 4687909-th square number.

21976490792281 is the 2343955-th centered octagonal number.

It is an amenable number.

21976490792281 is a deficient number, since it is larger than the sum of its proper divisors (49940792292).

21976490792281 is an frugal number, since it uses more digits than its factorization.

21976490792281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21260 (or 10630 counting only the distinct ones).

The product of its (nonzero) digits is 54867456, while the sum is 67.

The spelling of 21976490792281 in words is "twenty-one trillion, nine hundred seventy-six billion, four hundred ninety million, seven hundred ninety-two thousand, two hundred eighty-one".