21212022102121 has 4 divisors (see below), whose sum is σ = 22134283932672. Its totient is φ = 20289760271572.

The previous prime is 21212022102083. The next prime is 21212022102191. The reversal of 21212022102121 is 12120122021212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21212022102121 - 2¹⁵ = 21212022069353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212022102191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461130915241 + ... + 461130915286.

It is an arithmetic number, because the mean of its divisors is an integer number (5533570983168).

Almost surely, 2^{21212022102121} is an apocalyptic number.

It is an amenable number.

21212022102121 is a deficient number, since it is larger than the sum of its proper divisors (922261830551).

21212022102121 is an equidigital number, since it uses as much as digits as its factorization.

21212022102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922261830550.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21212022102121 its reverse (12120122021212), we get a palindrome (33332144123333).

The spelling of 21212022102121 in words is "twenty-one trillion, two hundred twelve billion, twenty-two million, one hundred two thousand, one hundred twenty-one".