21473038 has 4 divisors (see below), whose sum is σ = 32209560. Its totient is φ = 10736518.

The previous prime is 21473029. The next prime is 21473041. The reversal of 21473038 is 83037412.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21473038² = 922182721898888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21472997 and 21473015.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5368258 + ... + 5368261.

It is an arithmetic number, because the mean of its divisors is an integer number (8052390).

Almost surely, 2^21473038 is an apocalyptic number.

21473038 is a deficient number, since it is larger than the sum of its proper divisors (10736522).

21473038 is a wasteful number, since it uses less digits than its factorization.

21473038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10736521.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 21473038 is about 4633.9009484451. The cubic root of 21473038 is about 277.9486042696.

The spelling of 21473038 in words is "twenty-one million, four hundred seventy-three thousand, thirty-eight".