1212121311 has 16 divisors (see below), whose sum is σ = 1658659200. Its totient is φ = 787084128.

The previous prime is 1212121307. The next prime is 1212121331. The reversal of 1212121311 is 1131212121.

It is not a de Polignac number, because 1212121311 - 2² = 1212121307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212121331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12121 + ... + 50706.

It is an arithmetic number, because the mean of its divisors is an integer number (103666200).

Almost surely, 2^1212121311 is an apocalyptic number.

1212121311 is a deficient number, since it is larger than the sum of its proper divisors (446537889).

1212121311 is a wasteful number, since it uses less digits than its factorization.

1212121311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62998.

The product of its digits is 24, while the sum is 15.

The square root of 1212121311 is about 34815.5326111780. The cubic root of 1212121311 is about 1066.2245932539.

Adding to 1212121311 its reverse (1131212121), we get a palindrome (2343333432).

The spelling of 1212121311 in words is "one billion, two hundred twelve million, one hundred twenty-one thousand, three hundred eleven".