21772672 has 16 divisors (see below), whose sum is σ = 43375500. Its totient is φ = 10886272.

The previous prime is 21772607. The next prime is 21772691. The reversal of 21772672 is 27627712.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84922 + ... + 85177.

Almost surely, 2^21772672 is an apocalyptic number.

It is an amenable number.

21772672 is a deficient number, since it is larger than the sum of its proper divisors (21602828).

21772672 is an equidigital number, since it uses as much as digits as its factorization.

21772672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170113 (or 170101 counting only the distinct ones).

The product of its digits is 16464, while the sum is 34.

The square root of 21772672 is about 4666.1195869802. The cubic root of 21772672 is about 279.2354653733.

It can be divided in two parts, 2177267 and 2, that multiplied together give a palindrome (4354534).

The spelling of 21772672 in words is "twenty-one million, seven hundred seventy-two thousand, six hundred seventy-two".