21454198 has 4 divisors (see below), whose sum is σ = 32181300. Its totient is φ = 10727098.

The previous prime is 21454163. The next prime is 21454217. The reversal of 21454198 is 89145412.

It is a happy number.

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

It is a super-2 number, since 2×21454198² = 920565223646408, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5363548 + ... + 5363551.

It is an arithmetic number, because the mean of its divisors is an integer number (8045325).

Almost surely, 2^21454198 is an apocalyptic number.

21454198 is a deficient number, since it is larger than the sum of its proper divisors (10727102).

21454198 is a wasteful number, since it uses less digits than its factorization.

21454198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10727101.

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

The square root of 21454198 is about 4631.8676578676. The cubic root of 21454198 is about 277.8672916962.

The spelling of 21454198 in words is "twenty-one million, four hundred fifty-four thousand, one hundred ninety-eight".