21772088 has 16 divisors (see below), whose sum is σ = 43963080. Its totient is φ = 10048608.

The previous prime is 21772067. The next prime is 21772097. The reversal of 21772088 is 88027712.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104570 + ... + 104777.

Almost surely, 2^21772088 is an apocalyptic number.

It is an amenable number.

21772088 is an abundant number, since it is smaller than the sum of its proper divisors (22190992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21772088 is a wasteful number, since it uses less digits than its factorization.

21772088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209366 (or 209362 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 21772088 is about 4666.0570077958. The cubic root of 21772088 is about 279.2329687425.

The spelling of 21772088 in words is "twenty-one million, seven hundred seventy-two thousand, eighty-eight".