21202102120101 has 16 divisors (see below), whose sum is σ = 34208433673344. Its totient is φ = 11402811224064.

The previous prime is 21202102120099. The next prime is 21202102120117. The reversal of 21202102120101 is 10102120120212.

It is not a de Polignac number, because 21202102120101 - 2¹ = 21202102120099 is a prime.

It is a super-2 number, since 2×21202102120101² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202102120141) 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, 29694820540 + ... + 29694821253.

It is an arithmetic number, because the mean of its divisors is an integer number (2138027104584).

Almost surely, 2^{21202102120101} is an apocalyptic number.

21202102120101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21202102120101 is a deficient number, since it is larger than the sum of its proper divisors (13006331553243).

21202102120101 is a wasteful number, since it uses less digits than its factorization.

21202102120101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59389641820.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21202102120101 its reverse (10102120120212), we get a palindrome (31304222240313).

The spelling of 21202102120101 in words is "twenty-one trillion, two hundred two billion, one hundred two million, one hundred twenty thousand, one hundred one".