21598094700 has 432 divisors, whose sum is σ = 83689365760. Its totient is φ = 4536829440.

The previous prime is 21598094689. The next prime is 21598094729. The reversal of 21598094700 is 749089512.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 25142871 + ... + 25143729.

Almost surely, 2^21598094700 is an apocalyptic number.

21598094700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21598094700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41844682880).

21598094700 is an abundant number, since it is smaller than the sum of its proper divisors (62091271060).

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

21598094700 is a wasteful number, since it uses less digits than its factorization.

21598094700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206 (or 1196 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 21598094700 in words is "twenty-one billion, five hundred ninety-eight million, ninety-four thousand, seven hundred".