21424976 has 10 divisors (see below), whose sum is σ = 41510922. Its totient is φ = 10712480.

The previous prime is 21424973. The next prime is 21425003. The reversal of 21424976 is 67942412.

It can be written as a sum of positive squares in only one way, i.e., 15054400 + 6370576 = 3880^2 + 2524^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21424973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669515 + ... + 669546.

Almost surely, 2^21424976 is an apocalyptic number.

It is an amenable number.

21424976 is a deficient number, since it is larger than the sum of its proper divisors (20085946).

21424976 is a wasteful number, since it uses less digits than its factorization.

21424976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339069 (or 1339063 counting only the distinct ones).

The product of its digits is 24192, while the sum is 35.

The square root of 21424976 is about 4628.7121319002. The cubic root of 21424976 is about 277.7410766563.

The spelling of 21424976 in words is "twenty-one million, four hundred twenty-four thousand, nine hundred seventy-six".