21010100122001 has 4 divisors (see below), whose sum is σ = 21010115393904. Its totient is φ = 21010084850100.

The previous prime is 21010100121979. The next prime is 21010100122019. The reversal of 21010100122001 is 10022100101012.

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 a cyclic number.

It is not a de Polignac number, because 21010100122001 - 2⁶ = 21010100121937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010100022001) 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, 5342795 + ... + 8400336.

It is an arithmetic number, because the mean of its divisors is an integer number (5252528848476).

Almost surely, 2^{21010100122001} is an apocalyptic number.

It is an amenable number.

21010100122001 is a deficient number, since it is larger than the sum of its proper divisors (15271903).

21010100122001 is a wasteful number, since it uses less digits than its factorization.

21010100122001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15271902.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21010100122001 its reverse (10022100101012), we get a palindrome (31032200223013).

The spelling of 21010100122001 in words is "twenty-one trillion, ten billion, one hundred million, one hundred twenty-two thousand, one".