21192030000 has 900 divisors, whose sum is σ = 85773762360. Its totient is φ = 5038848000.

The previous prime is 21192029921. The next prime is 21192030011. The reversal of 21192030000 is 3029112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (900).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 179 ways as a sum of consecutive naturals, for example, 1115369991 + ... + 1115370009.

Almost surely, 2^21192030000 is an apocalyptic number.

21192030000 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 21192030000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42886881180).

21192030000 is an abundant number, since it is smaller than the sum of its proper divisors (64581732360).

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

21192030000 is an frugal number, since it uses more digits than its factorization.

21192030000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 46 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21192030000 its reverse (3029112), we get a palindrome (21195059112).

The spelling of 21192030000 in words is "twenty-one billion, one hundred ninety-two million, thirty thousand".