21063272 has 16 divisors (see below), whose sum is σ = 41817060. Its totient is φ = 9912064.

The previous prime is 21063257. The next prime is 21063281. The reversal of 21063272 is 27236012.

It can be written as a sum of positive squares in 2 ways, for example, as 19589476 + 1473796 = 4426^2 + 1214^2 .

It is a super-2 number, since 2×21063272² = 887322854691968, which contains 22 as substring.

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, 77303 + ... + 77574.

Almost surely, 2^21063272 is an apocalyptic number.

It is an amenable number.

21063272 is a deficient number, since it is larger than the sum of its proper divisors (20753788).

21063272 is a wasteful number, since it uses less digits than its factorization.

21063272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154900 (or 154896 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 21063272 is about 4589.4740439401. The cubic root of 21063272 is about 276.1692233953.

Adding to 21063272 its sum of digits (23), we get a triangular number (21063295 = T₆₄₉₀).

Adding to 21063272 its reverse (27236012), we get a palindrome (48299284).

The spelling of 21063272 in words is "twenty-one million, sixty-three thousand, two hundred seventy-two".