21264548 has 12 divisors (see below), whose sum is σ = 37255260. Its totient is φ = 10620192.

The previous prime is 21264541. The next prime is 21264559. The reversal of 21264548 is 84546212.

It can be written as a sum of positive squares in 2 ways, for example, as 11888704 + 9375844 = 3448^2 + 3062^2 .

It is not an unprimeable number, because it can be changed into a prime (21264541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1790 + ... + 6762.

It is an arithmetic number, because the mean of its divisors is an integer number (3104605).

Almost surely, 2^21264548 is an apocalyptic number.

It is an amenable number.

21264548 is a deficient number, since it is larger than the sum of its proper divisors (15990712).

21264548 is a wasteful number, since it uses less digits than its factorization.

21264548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6046 (or 6044 counting only the distinct ones).

The product of its digits is 15360, while the sum is 32.

The square root of 21264548 is about 4611.3499108179. The cubic root of 21264548 is about 277.0461070057.

It can be divided in two parts, 21264 and 548, that added together give a palindrome (21812).

The spelling of 21264548 in words is "twenty-one million, two hundred sixty-four thousand, five hundred forty-eight".