21612706371136 has 56 divisors (see below), whose sum is σ = 43341834104576. Its totient is φ = 10691990876160.

The previous prime is 21612706371127. The next prime is 21612706371163. The reversal of 21612706371136 is 63117360721612.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22061845 + ... + 23020651.

It is an arithmetic number, because the mean of its divisors is an integer number (773961323296).

Almost surely, 2^{21612706371136} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21612706371136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21670917052288).

21612706371136 is an abundant number, since it is smaller than the sum of its proper divisors (21729127733440).

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

21612706371136 is an equidigital number, since it uses as much as digits as its factorization.

21612706371136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962547 (or 962537 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 46.

The spelling of 21612706371136 in words is "twenty-one trillion, six hundred twelve billion, seven hundred six million, three hundred seventy-one thousand, one hundred thirty-six".