21112112100001 has 8 divisors (see below), whose sum is σ = 22736831874624. Its totient is φ = 19487493918480.

The previous prime is 21112112099999. The next prime is 21112112100031. The reversal of 21112112100001 is 10000121121112.

It is a happy number.

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 21112112100001 - 2¹ = 21112112099999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112112100031) 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, 24966391 + ... + 25798156.

It is an arithmetic number, because the mean of its divisors is an integer number (2842103984328).

Almost surely, 2^{21112112100001} is an apocalyptic number.

It is an amenable number.

21112112100001 is a deficient number, since it is larger than the sum of its proper divisors (1624719774623).

21112112100001 is a wasteful number, since it uses less digits than its factorization.

21112112100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50796551.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21112112100001 its reverse (10000121121112), we get a palindrome (31112233221113).

The spelling of 21112112100001 in words is "twenty-one trillion, one hundred twelve billion, one hundred twelve million, one hundred thousand, one".