21498051 has 8 divisors (see below), whose sum is σ = 28747600. Its totient is φ = 14290272.

The previous prime is 21498041. The next prime is 21498067. The reversal of 21498051 is 15089412.

It is a happy number.

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

It is not a de Polignac number, because 21498051 - 2¹¹ = 21496003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21498041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9220 + ... + 11313.

It is an arithmetic number, because the mean of its divisors is an integer number (3593450).

Almost surely, 2^21498051 is an apocalyptic number.

21498051 is a deficient number, since it is larger than the sum of its proper divisors (7249549).

21498051 is a wasteful number, since it uses less digits than its factorization.

21498051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20885.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 21498051 is about 4636.5990769097. The cubic root of 21498051 is about 278.0564857703.

The spelling of 21498051 in words is "twenty-one million, four hundred ninety-eight thousand, fifty-one".