21598098 has 64 divisors (see below), whose sum is σ = 48384000. Its totient is φ = 6398784.

The previous prime is 21598091. The next prime is 21598111. The reversal of 21598098 is 89089512.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21598091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 155313 + ... + 155451.

It is an arithmetic number, because the mean of its divisors is an integer number (756000).

Almost surely, 2^21598098 is an apocalyptic number.

21598098 is an abundant number, since it is smaller than the sum of its proper divisors (26785902).

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

21598098 is a wasteful number, since it uses less digits than its factorization.

21598098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 21598098 is about 4647.3753883240. The cubic root of 21598098 is about 278.4871554232.

The spelling of 21598098 in words is "twenty-one million, five hundred ninety-eight thousand, ninety-eight".