21272468 has 18 divisors (see below), whose sum is σ = 43305066. Its totient is φ = 9116688.

The previous prime is 21272453. The next prime is 21272473. The reversal of 21272468 is 86427212.

It can be written as a sum of positive squares in only one way, i.e., 11957764 + 9314704 = 3458^2 + 3052^2 .

It is a super-2 number, since 2×21272468² = 905035789622048, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54071 + ... + 54462.

It is an arithmetic number, because the mean of its divisors is an integer number (2405837).

Almost surely, 2^21272468 is an apocalyptic number.

21272468 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21272468 is an abundant number, since it is smaller than the sum of its proper divisors (22032598).

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

21272468 is a wasteful number, since it uses less digits than its factorization.

21272468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108551 (or 108542 counting only the distinct ones).

The product of its digits is 10752, while the sum is 32.

The square root of 21272468 is about 4612.2085815800. The cubic root of 21272468 is about 277.0804980935.

The spelling of 21272468 in words is "twenty-one million, two hundred seventy-two thousand, four hundred sixty-eight".