21777004 has 12 divisors (see below), whose sum is σ = 39339328. Its totient is φ = 10537200.

The previous prime is 21776987. The next prime is 21777013. The reversal of 21777004 is 40077712.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87687 + ... + 87934.

Almost surely, 2^21777004 is an apocalyptic number.

It is an amenable number.

21777004 is a deficient number, since it is larger than the sum of its proper divisors (17562324).

21777004 is a wasteful number, since it uses less digits than its factorization.

21777004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175656 (or 175654 counting only the distinct ones).

The product of its (nonzero) digits is 2744, while the sum is 28.

The square root of 21777004 is about 4666.5837611683. The cubic root of 21777004 is about 279.2539835080.

The spelling of 21777004 in words is "twenty-one million, seven hundred seventy-seven thousand, four".