31212121112 has 16 divisors (see below), whose sum is σ = 61067193840. Its totient is φ = 14927536096.

The previous prime is 31212121103. The next prime is 31212121151. The reversal of 31212121112 is 21112121213.

It is a happy number.

It is a super-2 number, since 2×31212121112² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84815363 + ... + 84815730.

It is an arithmetic number, because the mean of its divisors is an integer number (3816699615).

Almost surely, 2^31212121112 is an apocalyptic number.

It is an amenable number.

31212121112 is a deficient number, since it is larger than the sum of its proper divisors (29855072728).

31212121112 is a wasteful number, since it uses less digits than its factorization.

31212121112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169631122 (or 169631118 counting only the distinct ones).

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

Adding to 31212121112 its reverse (21112121213), we get a palindrome (52324242325).

The spelling of 31212121112 in words is "thirty-one billion, two hundred twelve million, one hundred twenty-one thousand, one hundred twelve".