21120122100001 has 4 divisors (see below), whose sum is σ = 21249693401392. Its totient is φ = 20990550798612.

The previous prime is 21120122099971. The next prime is 21120122100031. The reversal of 21120122100001 is 10000122102112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (21120122099971) and next prime (21120122100031).

It is a cyclic number.

It is not a de Polignac number, because 21120122100001 - 2⁷ = 21120122099873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120122100031) 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, 64785650451 + ... + 64785650776.

It is an arithmetic number, because the mean of its divisors is an integer number (5312423350348).

Almost surely, 2^{21120122100001} is an apocalyptic number.

It is an amenable number.

21120122100001 is a deficient number, since it is larger than the sum of its proper divisors (129571301391).

21120122100001 is a wasteful number, since it uses less digits than its factorization.

21120122100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129571301390.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21120122100001 its reverse (10000122102112), we get a palindrome (31120244202113).

The spelling of 21120122100001 in words is "twenty-one trillion, one hundred twenty billion, one hundred twenty-two million, one hundred thousand, one".