21207731342600 has 192 divisors, whose sum is σ = 54214009992000. Its totient is φ = 7651306368000.

The previous prime is 21207731342593. The next prime is 21207731342627. The reversal of 21207731342600 is 624313770212.

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, 287443715 + ... + 287517485.

It is an arithmetic number, because the mean of its divisors is an integer number (282364635375).

Almost surely, 2^{21207731342600} is an apocalyptic number.

21207731342600 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 21207731342600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27107004996000).

21207731342600 is an abundant number, since it is smaller than the sum of its proper divisors (33006278649400).

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

21207731342600 is a wasteful number, since it uses less digits than its factorization.

21207731342600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74824 (or 74815 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 38.

The spelling of 21207731342600 in words is "twenty-one trillion, two hundred seven billion, seven hundred thirty-one million, three hundred forty-two thousand, six hundred".