21977042 has 16 divisors (see below), whose sum is σ = 33868032. Its totient is φ = 10689840.

The previous prime is 21977027. The next prime is 21977063. The reversal of 21977042 is 24077912.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35903 + ... + 36509.

It is an arithmetic number, because the mean of its divisors is an integer number (2116752).

Almost surely, 2^21977042 is an apocalyptic number.

21977042 is a deficient number, since it is larger than the sum of its proper divisors (11890990).

21977042 is a wasteful number, since it uses less digits than its factorization.

21977042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 21977042 is about 4687.9677899917. The cubic root of 21977042 is about 280.1064306280.

The spelling of 21977042 in words is "twenty-one million, nine hundred seventy-seven thousand, forty-two".