21974945426 has 12 divisors (see below), whose sum is σ = 38344037598. Its totient is φ = 9417833712.

The previous prime is 21974945393. The next prime is 21974945437. The reversal of 21974945426 is 62454947912.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20606315401 + 1368630025 = 143549^2 + 36995^2 .

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, 112116971 + ... + 112117166.

Almost surely, 2^21974945426 is an apocalyptic number.

21974945426 is a deficient number, since it is larger than the sum of its proper divisors (16369092172).

21974945426 is a wasteful number, since it uses less digits than its factorization.

21974945426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224234153 (or 224234146 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 53.

The spelling of 21974945426 in words is "twenty-one billion, nine hundred seventy-four million, nine hundred forty-five thousand, four hundred twenty-six".