1212381116 has 12 divisors (see below), whose sum is σ = 2138373888. Its totient is φ = 601417152.

The previous prime is 1212381091. The next prime is 1212381119. The reversal of 1212381116 is 6111832121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212381119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1192781 + ... + 1193796.

It is an arithmetic number, because the mean of its divisors is an integer number (178197824).

Almost surely, 2^1212381116 is an apocalyptic number.

It is an amenable number.

1212381116 is a deficient number, since it is larger than the sum of its proper divisors (925992772).

1212381116 is a wasteful number, since it uses less digits than its factorization.

1212381116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2386708 (or 2386706 counting only the distinct ones).

The product of its digits is 576, while the sum is 26.

The square root of 1212381116 is about 34819.2635763596. The cubic root of 1212381116 is about 1066.3007656878.

It can be divided in two parts, 12123 and 81116, that added together give a palindrome (93239).

The spelling of 1212381116 in words is "one billion, two hundred twelve million, three hundred eighty-one thousand, one hundred sixteen".