21770804 has 36 divisors (see below), whose sum is σ = 43257984. Its totient is φ = 9570000.

The previous prime is 21770803. The next prime is 21770831. The reversal of 21770804 is 40807712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21770803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14279 + ... + 15729.

Almost surely, 2^21770804 is an apocalyptic number.

It is an amenable number.

21770804 is a deficient number, since it is larger than the sum of its proper divisors (21487180).

21770804 is a wasteful number, since it uses less digits than its factorization.

21770804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508 (or 1495 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 21770804 is about 4665.9194163637. The cubic root of 21770804 is about 279.2274794178.

The spelling of 21770804 in words is "twenty-one million, seven hundred seventy thousand, eight hundred four".