21212011222013 has 4 divisors (see below), whose sum is σ = 21212022642720. Its totient is φ = 21211999801308.

The previous prime is 21212011221991. The next prime is 21212011222049. The reversal of 21212011222013 is 31022211021212.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21212011222013 - 2¹⁶ = 21212011156477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212011222093) 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, 2208545 + ... + 6877622.

It is an arithmetic number, because the mean of its divisors is an integer number (5303005660680).

Almost surely, 2^{21212011222013} is an apocalyptic number.

It is an amenable number.

21212011222013 is a deficient number, since it is larger than the sum of its proper divisors (11420707).

21212011222013 is an equidigital number, since it uses as much as digits as its factorization.

21212011222013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11420706.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21212011222013 its reverse (31022211021212), we get a palindrome (52234222243225).

The spelling of 21212011222013 in words is "twenty-one trillion, two hundred twelve billion, eleven million, two hundred twenty-two thousand, thirteen".