21013222212131 has 4 divisors (see below), whose sum is σ = 21013232998200. Its totient is φ = 21013211426064.

The previous prime is 21013222212109. The next prime is 21013222212149. The reversal of 21013222212131 is 13121222231012.

It is a semiprime because it is the product of two primes, 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 21013222212131 - 2¹⁴ = 21013222195747 is a prime.

It is a super-2 number, since 2×21013222212131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21013222212097 and 21013222212106.

It is not an unprimeable number, because it can be changed into a prime (21013222211131) 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, 1565066 + ... + 6669023.

It is an arithmetic number, because the mean of its divisors is an integer number (5253308249550).

Almost surely, 2^{21013222212131} is an apocalyptic number.

21013222212131 is a deficient number, since it is larger than the sum of its proper divisors (10786069).

21013222212131 is an equidigital number, since it uses as much as digits as its factorization.

21013222212131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10786068.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21013222212131 its reverse (13121222231012), we get a palindrome (34134444443143).

The spelling of 21013222212131 in words is "twenty-one trillion, thirteen billion, two hundred twenty-two million, two hundred twelve thousand, one hundred thirty-one".