221212321131031 has 8 divisors (see below), whose sum is σ = 230832687204864. Its totient is φ = 211592158312920.

The previous prime is 221212321131023. The next prime is 221212321131037. The reversal of 221212321131031 is 130131123212122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221212321131031 - 2³ = 221212321131023 is a prime.

It is a super-2 number, since 2×221212321131031² (a number of 29 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 = 221212321130987 and 221212321131005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212321131037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48587835 + ... + 52945276.

It is an arithmetic number, because the mean of its divisors is an integer number (28854085900608).

Almost surely, 2^{221212321131031} is an apocalyptic number.

221212321131031 is a deficient number, since it is larger than the sum of its proper divisors (9620366073833).

221212321131031 is a wasteful number, since it uses less digits than its factorization.

221212321131031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101627861.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 221212321131031 its reverse (130131123212122), we get a palindrome (351343444343153).

The spelling of 221212321131031 in words is "two hundred twenty-one trillion, two hundred twelve billion, three hundred twenty-one million, one hundred thirty-one thousand, thirty-one".