21000112222201 has 32 divisors (see below), whose sum is σ = 26710319255040. Its totient is φ = 16086407479296.

The previous prime is 21000112222147. The next prime is 21000112222223. The reversal of 21000112222201 is 10222221100012.

It is a happy number.

It is not a de Polignac number, because 21000112222201 - 2²³ = 21000103833593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21000112222801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27627496 + ... + 28377433.

It is an arithmetic number, because the mean of its divisors is an integer number (834697476720).

Almost surely, 2^{21000112222201} is an apocalyptic number.

It is an amenable number.

21000112222201 is a deficient number, since it is larger than the sum of its proper divisors (5710207032839).

21000112222201 is a wasteful number, since it uses less digits than its factorization.

21000112222201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56005113.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21000112222201 its reverse (10222221100012), we get a palindrome (31222333322213).

The spelling of 21000112222201 in words is "twenty-one trillion, one hundred twelve million, two hundred twenty-two thousand, two hundred one".