21478048 has 12 divisors (see below), whose sum is σ = 42284970. Its totient is φ = 10739008.

The previous prime is 21478007. The next prime is 21478049. The reversal of 21478048 is 84087412.

It can be written as a sum of positive squares in only one way, i.e., 16224784 + 5253264 = 4028^2 + 2292^2 .

It is a super-2 number, since 2×21478048² = 922613091780608, which contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21478049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335563 + ... + 335626.

Almost surely, 2^21478048 is an apocalyptic number.

It is an amenable number.

21478048 is a deficient number, since it is larger than the sum of its proper divisors (20806922).

21478048 is an equidigital number, since it uses as much as digits as its factorization.

21478048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671199 (or 671191 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 21478048 is about 4634.4414981743. The cubic root of 21478048 is about 277.9702191931.

It can be divided in two parts, 2 and 1478048, that multiplied together give a triangular number (2956096 = T₂₄₃₁).

The spelling of 21478048 in words is "twenty-one million, four hundred seventy-eight thousand, forty-eight".