21025000098 has 48 divisors (see below), whose sum is σ = 45932399136. Its totient is φ = 6950247360.

The previous prime is 21025000091. The next prime is 21025000109. The reversal of 21025000098 is 89000052012.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21025000091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2864293 + ... + 2871623.

It is an arithmetic number, because the mean of its divisors is an integer number (956924982).

Almost surely, 2^21025000098 is an apocalyptic number.

21025000098 is an abundant number, since it is smaller than the sum of its proper divisors (24907399038).

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

21025000098 is a wasteful number, since it uses less digits than its factorization.

21025000098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8639 (or 8636 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The spelling of 21025000098 in words is "twenty-one billion, twenty-five million, ninety-eight", and thus it is an aban number and an uban number.