21101646412736 has 28 divisors (see below), whose sum is σ = 41921326096728. Its totient is φ = 10538792593152.

The previous prime is 21101646412723. The next prime is 21101646412739. The reversal of 21101646412736 is 63721464610112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101646412739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187921766 + ... + 188034021.

Almost surely, 2^{21101646412736} is an apocalyptic number.

It is an amenable number.

21101646412736 is a deficient number, since it is larger than the sum of its proper divisors (20819679683992).

21101646412736 is an equidigital number, since it uses as much as digits as its factorization.

21101646412736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375956676 (or 375956666 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 21101646412736 in words is "twenty-one trillion, one hundred one billion, six hundred forty-six million, four hundred twelve thousand, seven hundred thirty-six".