21219019200 has 420 divisors, whose sum is σ = 82592338752. Its totient is φ = 5325004800.

The previous prime is 21219019169. The next prime is 21219019229. The reversal of 21219019200 is 291091212.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 2198385 + ... + 2208015.

Almost surely, 2^21219019200 is an apocalyptic number.

21219019200 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 21219019200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41296169376).

21219019200 is an abundant number, since it is smaller than the sum of its proper divisors (61373319552).

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

21219019200 is a wasteful number, since it uses less digits than its factorization.

21219019200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9682 (or 9658 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The spelling of 21219019200 in words is "twenty-one billion, two hundred nineteen million, nineteen thousand, two hundred".