21850198100 has 36 divisors (see below), whose sum is σ = 48944450688. Its totient is φ = 8458140000.

The previous prime is 21850198093. The next prime is 21850198121. The reversal of 21850198100 is 189105812.

It is a super-2 number, since 2×21850198100² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3521126 + ... + 3527325.

Almost surely, 2^21850198100 is an apocalyptic number.

21850198100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21850198100 is an abundant number, since it is smaller than the sum of its proper divisors (27094252588).

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

21850198100 is a wasteful number, since it uses less digits than its factorization.

21850198100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7048496 (or 7048489 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 35.

The spelling of 21850198100 in words is "twenty-one billion, eight hundred fifty million, one hundred ninety-eight thousand, one hundred".