21481598 has 4 divisors (see below), whose sum is σ = 32222400. Its totient is φ = 10740798.

The previous prime is 21481597. The next prime is 21481613. The reversal of 21481598 is 89518412.

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

It is a super-2 number, since 2×21481598² = 922918105267208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21481597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5370398 + ... + 5370401.

It is an arithmetic number, because the mean of its divisors is an integer number (8055600).

Almost surely, 2^21481598 is an apocalyptic number.

21481598 is a deficient number, since it is larger than the sum of its proper divisors (10740802).

21481598 is a wasteful number, since it uses less digits than its factorization.

21481598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10740801.

The product of its digits is 23040, while the sum is 38.

The square root of 21481598 is about 4634.8244842712. The cubic root of 21481598 is about 277.9855331222.

The spelling of 21481598 in words is "twenty-one million, four hundred eighty-one thousand, five hundred ninety-eight".