21102202212021 has 48 divisors (see below), whose sum is σ = 35173684076544. Its totient is φ = 11941378165152.

The previous prime is 21102202211999. The next prime is 21102202212043. The reversal of 21102202212021 is 12021220220112.

It is a happy number.

21102202212021 is a `hidden beast` number, since 21 + 1 + 0 + 220 + 221 + 202 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (21102202211999) and next prime (21102202212043).

It is not a de Polignac number, because 21102202212021 - 2⁶ = 21102202211957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21102202211985 and 21102202212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102202212821) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18086676 + ... + 19218018.

It is an arithmetic number, because the mean of its divisors is an integer number (732785084928).

Almost surely, 2^{21102202212021} is an apocalyptic number.

21102202212021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21102202212021 is a deficient number, since it is larger than the sum of its proper divisors (14071481864523).

21102202212021 is a wasteful number, since it uses less digits than its factorization.

21102202212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134230 (or 1134227 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21102202212021 its reverse (12021220220112), we get a palindrome (33123422432133).

It can be divided in two parts, 2110220 and 2212021, that added together give a square (4322241 = 2079²).

The spelling of 21102202212021 in words is "twenty-one trillion, one hundred two billion, two hundred two million, two hundred twelve thousand, twenty-one".