21038478 has 16 divisors (see below), whose sum is σ = 42166656. Its totient is φ = 6997880.

The previous prime is 21038467. The next prime is 21038483. The reversal of 21038478 is 87483012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 468 + ... + 6503.

It is an arithmetic number, because the mean of its divisors is an integer number (2635416).

Almost surely, 2^21038478 is an apocalyptic number.

21038478 is an abundant number, since it is smaller than the sum of its proper divisors (21128178).

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

21038478 is a wasteful number, since it uses less digits than its factorization.

21038478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7479.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 21038478 is about 4586.7720675874. The cubic root of 21038478 is about 276.0608194051.

The spelling of 21038478 in words is "twenty-one million, thirty-eight thousand, four hundred seventy-eight".