21465898 has 4 divisors (see below), whose sum is σ = 32198850. Its totient is φ = 10732948.

The previous prime is 21465881. The next prime is 21465907. The reversal of 21465898 is 89856412.

It is a happy number.

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., 19651489 + 1814409 = 4433^2 + 1347^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5366473 + ... + 5366476.

Almost surely, 2^21465898 is an apocalyptic number.

21465898 is a deficient number, since it is larger than the sum of its proper divisors (10732952).

21465898 is a wasteful number, since it uses less digits than its factorization.

21465898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10732951.

The product of its digits is 138240, while the sum is 43.

The square root of 21465898 is about 4633.1304751755. The cubic root of 21465898 is about 277.9177939570.

The spelling of 21465898 in words is "twenty-one million, four hundred sixty-five thousand, eight hundred ninety-eight".