21974632 has 8 divisors (see below), whose sum is σ = 41202450. Its totient is φ = 10987312.

The previous prime is 21974627. The next prime is 21974651. The reversal of 21974632 is 23647912.

It can be written as a sum of positive squares in only one way, i.e., 13645636 + 8328996 = 3694^2 + 2886^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1373407 + ... + 1373422.

Almost surely, 2^21974632 is an apocalyptic number.

It is an amenable number.

21974632 is a deficient number, since it is larger than the sum of its proper divisors (19227818).

21974632 is a wasteful number, since it uses less digits than its factorization.

21974632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2746835 (or 2746831 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 21974632 is about 4687.7107419294. The cubic root of 21974632 is about 280.0961914403.

The spelling of 21974632 in words is "twenty-one million, nine hundred seventy-four thousand, six hundred thirty-two".