21248772 has 24 divisors (see below), whose sum is σ = 49763616. Its totient is φ = 7056768.

The previous prime is 21248771. The next prime is 21248779. The reversal of 21248772 is 27784212.

It is not an unprimeable number, because it can be changed into a prime (21248771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268 + ... + 6524.

It is an arithmetic number, because the mean of its divisors is an integer number (2073484).

Almost surely, 2^21248772 is an apocalyptic number.

It is an amenable number.

21248772 is an abundant number, since it is smaller than the sum of its proper divisors (28514844).

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

21248772 is a wasteful number, since it uses less digits than its factorization.

21248772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6547 (or 6545 counting only the distinct ones).

The product of its digits is 12544, while the sum is 33.

The square root of 21248772 is about 4609.6390314210. The cubic root of 21248772 is about 276.9775772837.

It can be divided in two parts, 212 and 48772, that added together give a palindrome (48984).

The spelling of 21248772 in words is "twenty-one million, two hundred forty-eight thousand, seven hundred seventy-two".