221212203131 has 2 divisors, whose sum is σ = 221212203132. Its totient is φ = 221212203130.

The previous prime is 221212203053. The next prime is 221212203229. The reversal of 221212203131 is 131302212122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221212203131 is a prime.

It is a super-2 number, since 2×221212203131² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221212203031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110606101565 + 110606101566.

It is an arithmetic number, because the mean of its divisors is an integer number (110606101566).

Almost surely, 2^221212203131 is an apocalyptic number.

221212203131 is a deficient number, since it is larger than the sum of its proper divisors (1).

221212203131 is an equidigital number, since it uses as much as digits as its factorization.

221212203131 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 20.

Adding to 221212203131 its reverse (131302212122), we get a palindrome (352514415253).

The spelling of 221212203131 in words is "two hundred twenty-one billion, two hundred twelve million, two hundred three thousand, one hundred thirty-one".