21772084 has 12 divisors (see below), whose sum is σ = 38584000. Its totient is φ = 10748088.

The previous prime is 21772067. The next prime is 21772097. The reversal of 21772084 is 48027712.

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, 34134 + ... + 34765.

Almost surely, 2^21772084 is an apocalyptic number.

It is an amenable number.

21772084 is a deficient number, since it is larger than the sum of its proper divisors (16811916).

21772084 is a wasteful number, since it uses less digits than its factorization.

21772084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68982 (or 68980 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 21772084 is about 4666.0565791683. The cubic root of 21772084 is about 279.2329516421.

Adding to 21772084 its reverse (48027712), we get a palindrome (69799796).

The spelling of 21772084 in words is "twenty-one million, seven hundred seventy-two thousand, eighty-four".