21194898900 has 144 divisors (see below), whose sum is σ = 70195090560. Its totient is φ = 4836902400.

The previous prime is 21194898883. The next prime is 21194898931. The reversal of 21194898900 is 989849112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1380466 + ... + 1395734.

Almost surely, 2^21194898900 is an apocalyptic number.

21194898900 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 21194898900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35097545280).

21194898900 is an abundant number, since it is smaller than the sum of its proper divisors (49000191660).

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

21194898900 is a wasteful number, since it uses less digits than its factorization.

21194898900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15954 (or 15947 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 51.

The spelling of 21194898900 in words is "twenty-one billion, one hundred ninety-four million, eight hundred ninety-eight thousand, nine hundred".