21133498 has 4 divisors (see below), whose sum is σ = 31700250. Its totient is φ = 10566748.

The previous prime is 21133493. The next prime is 21133513. The reversal of 21133498 is 89433112.

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., 21132409 + 1089 = 4597^2 + 33^2 .

It is not an unprimeable number, because it can be changed into a prime (21133493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5283373 + ... + 5283376.

Almost surely, 2^21133498 is an apocalyptic number.

21133498 is a deficient number, since it is larger than the sum of its proper divisors (10566752).

21133498 is a wasteful number, since it uses less digits than its factorization.

21133498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10566751.

The product of its digits is 5184, while the sum is 31.

The square root of 21133498 is about 4597.1184452872. The cubic root of 21133498 is about 276.4758035871.

The spelling of 21133498 in words is "twenty-one million, one hundred thirty-three thousand, four hundred ninety-eight".