121331021312 has 40 divisors (see below), whose sum is σ = 242504809800. Its totient is φ = 60645556224.

The previous prime is 121331021281. The next prime is 121331021333. The reversal of 121331021312 is 213120133121.

It is a happy number.

It is a super-2 number, since 2×121331021312² (a number of 23 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, 1585139 + ... + 1659917.

It is an arithmetic number, because the mean of its divisors is an integer number (6062620245).

Almost surely, 2^121331021312 is an apocalyptic number.

It is an amenable number.

121331021312 is a deficient number, since it is larger than the sum of its proper divisors (121173788488).

121331021312 is an frugal number, since it uses more digits than its factorization.

121331021312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77966 (or 77950 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 121331021312 its reverse (213120133121), we get a palindrome (334451154433).

The spelling of 121331021312 in words is "one hundred twenty-one billion, three hundred thirty-one million, twenty-one thousand, three hundred twelve".