21976561450 has 12 divisors (see below), whose sum is σ = 40876404390. Its totient is φ = 8790624560.

The previous prime is 21976561429. The next prime is 21976561463. The reversal of 21976561450 is 5416567912.

It can be written as a sum of positive squares in 3 ways, for example, as 21536443009 + 440118441 = 146753^2 + 20979^2 .

It is a super-2 number, since 2×21976561450² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21976561450.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 219765565 + ... + 219765664.

Almost surely, 2^21976561450 is an apocalyptic number.

21976561450 is a deficient number, since it is larger than the sum of its proper divisors (18899842940).

21976561450 is a wasteful number, since it uses less digits than its factorization.

21976561450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439531241 (or 439531236 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 46.

The spelling of 21976561450 in words is "twenty-one billion, nine hundred seventy-six million, five hundred sixty-one thousand, four hundred fifty".