21967772 has 6 divisors (see below), whose sum is σ = 38443608. Its totient is φ = 10983884.

The previous prime is 21967769. The next prime is 21967793. The reversal of 21967772 is 27776912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2745968 + ... + 2745975.

It is an arithmetic number, because the mean of its divisors is an integer number (6407268).

Almost surely, 2^21967772 is an apocalyptic number.

It is an amenable number.

21967772 is a deficient number, since it is larger than the sum of its proper divisors (16475836).

21967772 is a wasteful number, since it uses less digits than its factorization.

21967772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5491947 (or 5491945 counting only the distinct ones).

The product of its digits is 74088, while the sum is 41.

The square root of 21967772 is about 4686.9789843779. The cubic root of 21967772 is about 280.0670417697.

The spelling of 21967772 in words is "twenty-one million, nine hundred sixty-seven thousand, seven hundred seventy-two".