21453498 has 48 divisors (see below), whose sum is σ = 52599456. Its totient is φ = 6499440.

The previous prime is 21453493. The next prime is 21453529. The reversal of 21453498 is 89435412.

It is not an unprimeable number, because it can be changed into a prime (21453493) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3340 + ... + 7352.

It is an arithmetic number, because the mean of its divisors is an integer number (1095822).

Almost surely, 2^21453498 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21453498, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26299728).

21453498 is an abundant number, since it is smaller than the sum of its proper divisors (31145958).

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

21453498 is a wasteful number, since it uses less digits than its factorization.

21453498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4041 (or 4029 counting only the distinct ones).

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

The square root of 21453498 is about 4631.7920937797. The cubic root of 21453498 is about 277.8642696114.

The spelling of 21453498 in words is "twenty-one million, four hundred fifty-three thousand, four hundred ninety-eight".