21154498 has 8 divisors (see below), whose sum is σ = 31864140. Its totient is φ = 10533120.

The previous prime is 21154489. The next prime is 21154519. The reversal of 21154498 is 89445112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17867529 + 3286969 = 4227^2 + 1813^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21463 + ... + 22426.

Almost surely, 2^21154498 is an apocalyptic number.

21154498 is a deficient number, since it is larger than the sum of its proper divisors (10709642).

21154498 is a wasteful number, since it uses less digits than its factorization.

21154498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44132.

The product of its digits is 11520, while the sum is 34.

The square root of 21154498 is about 4599.4019176410. The cubic root of 21154498 is about 276.5673497165.

The spelling of 21154498 in words is "twenty-one million, one hundred fifty-four thousand, four hundred ninety-eight".