21498345 has 64 divisors (see below), whose sum is σ = 43130880. Its totient is φ = 10065600.

The previous prime is 21498343. The next prime is 21498377. The reversal of 21498345 is 54389412.

It is not a de Polignac number, because 21498345 - 2¹ = 21498343 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21498341) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 45802 + ... + 46268.

It is an arithmetic number, because the mean of its divisors is an integer number (673920).

Almost surely, 2^21498345 is an apocalyptic number.

It is an amenable number.

21498345 is an abundant number, since it is smaller than the sum of its proper divisors (21632535).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21498345 is a wasteful number, since it uses less digits than its factorization.

21498345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523 (or 517 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 21498345 is about 4636.6307810737. The cubic root of 21498345 is about 278.0577532997.

The spelling of 21498345 in words is "twenty-one million, four hundred ninety-eight thousand, three hundred forty-five".