1213321992 has 16 divisors (see below), whose sum is σ = 3033305040. Its totient is φ = 404440656.

The previous prime is 1213321987. The next prime is 1213321997. The reversal of 1213321992 is 2991233121.

It is an interprime number because it is at equal distance from previous prime (1213321987) and next prime (1213321997).

It is not an unprimeable number, because it can be changed into a prime (1213321997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25277518 + ... + 25277565.

It is an arithmetic number, because the mean of its divisors is an integer number (189581565).

Almost surely, 2^1213321992 is an apocalyptic number.

1213321992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1213321992 is an abundant number, since it is smaller than the sum of its proper divisors (1819983048).

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

1213321992 is a wasteful number, since it uses less digits than its factorization.

1213321992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50555092 (or 50555088 counting only the distinct ones).

The product of its digits is 5832, while the sum is 33.

The square root of 1213321992 is about 34832.7718104661. The cubic root of 1213321992 is about 1066.5765308384.

The spelling of 1213321992 in words is "one billion, two hundred thirteen million, three hundred twenty-one thousand, nine hundred ninety-two".