21977048 has 8 divisors (see below), whose sum is σ = 41206980. Its totient is φ = 10988520.

The previous prime is 21977027. The next prime is 21977063. The reversal of 21977048 is 84077912.

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

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, 1373558 + ... + 1373573.

Almost surely, 2^21977048 is an apocalyptic number.

It is an amenable number.

21977048 is a deficient number, since it is larger than the sum of its proper divisors (19229932).

21977048 is a wasteful number, since it uses less digits than its factorization.

21977048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2747137 (or 2747133 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 21977048 is about 4687.9684299278. The cubic root of 21977048 is about 280.1064561188.

The spelling of 21977048 in words is "twenty-one million, nine hundred seventy-seven thousand, forty-eight".