1212111320 has 32 divisors (see below), whose sum is σ = 3116858400. Its totient is φ = 415580928.

The previous prime is 1212111319. The next prime is 1212111323. The reversal of 1212111320 is 231112121.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 1212111295 and 1212111304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212111323) 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, 2164205 + ... + 2164764.

It is an arithmetic number, because the mean of its divisors is an integer number (97401825).

Almost surely, 2^1212111320 is an apocalyptic number.

1212111320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212111320 is an abundant number, since it is smaller than the sum of its proper divisors (1904747080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1212111320 is a wasteful number, since it uses less digits than its factorization.

1212111320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4328987 (or 4328983 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1212111320 is about 34815.3891260747. The cubic root of 1212111320 is about 1066.2216637673.

Adding to 1212111320 its reverse (231112121), we get a palindrome (1443223441).

The spelling of 1212111320 in words is "one billion, two hundred twelve million, one hundred eleven thousand, three hundred twenty".