21102220202001 has 16 divisors (see below), whose sum is σ = 28179399376128. Its totient is φ = 14046609776400.

The previous prime is 21102220201999. The next prime is 21102220202009. The reversal of 21102220202001 is 10020202220112.

It is not a de Polignac number, because 21102220202001 - 2¹ = 21102220201999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21102220202009) 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, 3343806 + ... + 7306536.

It is an arithmetic number, because the mean of its divisors is an integer number (1761212461008).

Almost surely, 2^{21102220202001} is an apocalyptic number.

It is an amenable number.

21102220202001 is a deficient number, since it is larger than the sum of its proper divisors (7077179174127).

21102220202001 is a wasteful number, since it uses less digits than its factorization.

21102220202001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3965452.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21102220202001 its reverse (10020202220112), we get a palindrome (31122422422113).

The spelling of 21102220202001 in words is "twenty-one trillion, one hundred two billion, two hundred twenty million, two hundred two thousand, one".