20021210222101 has 16 divisors (see below), whose sum is σ = 21861568447488. Its totient is φ = 18184230111600.

The previous prime is 20021210222089. The next prime is 20021210222129. The reversal of 20021210222101 is 10122201212002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20021210222101 - 2²⁵ = 20021176667669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021210202101) 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, 124862686 + ... + 125022928.

It is an arithmetic number, because the mean of its divisors is an integer number (1366348027968).

Almost surely, 2^{20021210222101} is an apocalyptic number.

It is an amenable number.

20021210222101 is a deficient number, since it is larger than the sum of its proper divisors (1840358225387).

20021210222101 is a wasteful number, since it uses less digits than its factorization.

20021210222101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170712.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20021210222101 its reverse (10122201212002), we get a palindrome (30143411434103).

The spelling of 20021210222101 in words is "twenty trillion, twenty-one billion, two hundred ten million, two hundred twenty-two thousand, one hundred one".