21556112387701 has 8 divisors (see below), whose sum is σ = 21624939183744. Its totient is φ = 21487382464800.

The previous prime is 21556112387699. The next prime is 21556112387749. The reversal of 21556112387701 is 10778321165512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21556112387701 - 2¹ = 21556112387699 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21556112387791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23772525 + ... + 24662626.

It is an arithmetic number, because the mean of its divisors is an integer number (2703117397968).

Almost surely, 2^{21556112387701} is an apocalyptic number.

It is an amenable number.

21556112387701 is a deficient number, since it is larger than the sum of its proper divisors (68826796043).

21556112387701 is an equidigital number, since it uses as much as digits as its factorization.

21556112387701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48436571.

The product of its (nonzero) digits is 705600, while the sum is 49.

The spelling of 21556112387701 in words is "twenty-one trillion, five hundred fifty-six billion, one hundred twelve million, three hundred eighty-seven thousand, seven hundred one".