221212111031 has 8 divisors (see below), whose sum is σ = 224240217264. Its totient is φ = 218192645440.

The previous prime is 221212111009. The next prime is 221212111061. The reversal of 221212111031 is 130111212122.

It is a happy number.

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 221212111031 - 2¹⁴ = 221212094647 is a prime.

It is a super-2 number, since 2×221212111031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212111061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2108600 + ... + 2211021.

It is an arithmetic number, because the mean of its divisors is an integer number (28030027158).

Almost surely, 2^221212111031 is an apocalyptic number.

221212111031 is a deficient number, since it is larger than the sum of its proper divisors (3028106233).

221212111031 is an equidigital number, since it uses as much as digits as its factorization.

221212111031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4320321.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 221212111031 its reverse (130111212122), we get a palindrome (351323323153).

The spelling of 221212111031 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred eleven thousand, thirty-one".