21119505900 has 288 divisors, whose sum is σ = 65048003328. Its totient is φ = 5283532800.

The previous prime is 21119505889. The next prime is 21119505931. The reversal of 21119505900 is 950591112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 38609427 + ... + 38609973.

Almost surely, 2^21119505900 is an apocalyptic number.

21119505900 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 21119505900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32524001664).

21119505900 is an abundant number, since it is smaller than the sum of its proper divisors (43928497428).

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

21119505900 is a wasteful number, since it uses less digits than its factorization.

21119505900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721 (or 714 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 33.

The spelling of 21119505900 in words is "twenty-one billion, one hundred nineteen million, five hundred five thousand, nine hundred".