21473698 has 4 divisors (see below), whose sum is σ = 32210550. Its totient is φ = 10736848.

The previous prime is 21473671. The next prime is 21473707. The reversal of 21473698 is 89637412.

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

It can be written as a sum of positive squares in only one way, i.e., 14645929 + 6827769 = 3827^2 + 2613^2 .

It is a super-2 number, since 2×21473698² = 922239411590408, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 21473698.

It is an unprimeable number.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5368423 + ... + 5368426.

Almost surely, 2^21473698 is an apocalyptic number.

21473698 is a deficient number, since it is larger than the sum of its proper divisors (10736852).

21473698 is a wasteful number, since it uses less digits than its factorization.

21473698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10736851.

The product of its digits is 72576, while the sum is 40.

The square root of 21473698 is about 4633.9721621952. The cubic root of 21473698 is about 277.9514519368.

The spelling of 21473698 in words is "twenty-one million, four hundred seventy-three thousand, six hundred ninety-eight".