21212210321131 has 2 divisors, whose sum is σ = 21212210321132. Its totient is φ = 21212210321130.

The previous prime is 21212210321119. The next prime is 21212210321147. The reversal of 21212210321131 is 13112301221212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21212210321131 - 2³⁷ = 21074771367659 is a prime.

It is a super-2 number, since 2×21212210321131² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21212210321111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606105160565 + 10606105160566.

It is an arithmetic number, because the mean of its divisors is an integer number (10606105160566).

Almost surely, 2^{21212210321131} is an apocalyptic number.

21212210321131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212210321131 is an equidigital number, since it uses as much as digits as its factorization.

21212210321131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21212210321131 its reverse (13112301221212), we get a palindrome (34324511542343).

The spelling of 21212210321131 in words is "twenty-one trillion, two hundred twelve billion, two hundred ten million, three hundred twenty-one thousand, one hundred thirty-one".