21379600000 has 384 divisors, whose sum is σ = 59953037760. Its totient is φ = 7526400000.

The previous prime is 21379599979. The next prime is 21379600001. The reversal of 21379600000 is 697312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21379600001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 189199944 + ... + 189200056.

Almost surely, 2^21379600000 is an apocalyptic number.

21379600000 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 21379600000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29976518880).

21379600000 is an abundant number, since it is smaller than the sum of its proper divisors (38573437760).

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

21379600000 is an equidigital number, since it uses as much as digits as its factorization.

21379600000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 28.

The spelling of 21379600000 in words is "twenty-one billion, three hundred seventy-nine million, six hundred thousand".