21010122122101 has 16 divisors (see below), whose sum is σ = 24038050284288. Its totient is φ = 17988819148800.

The previous prime is 21010122121999. The next prime is 21010122122137. The reversal of 21010122122101 is 10122122101012.

It is a cyclic number.

It is not a de Polignac number, because 21010122122101 - 2⁹ = 21010122121589 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 (21010122122161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55244271 + ... + 55623283.

It is an arithmetic number, because the mean of its divisors is an integer number (1502378142768).

Almost surely, 2^{21010122122101} is an apocalyptic number.

It is an amenable number.

21010122122101 is a deficient number, since it is larger than the sum of its proper divisors (3027928162187).

21010122122101 is a wasteful number, since it uses less digits than its factorization.

21010122122101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387732.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21010122122101 its reverse (10122122101012), we get a palindrome (31132244223113).

The spelling of 21010122122101 in words is "twenty-one trillion, ten billion, one hundred twenty-two million, one hundred twenty-two thousand, one hundred one".