1212402113 has 6 divisors (see below), whose sum is σ = 1312837974. Its totient is φ = 1119140256.

The previous prime is 1212402091. The next prime is 1212402119. The reversal of 1212402113 is 3112042121.

It can be written as a sum of positive squares in 3 ways, for example, as 4631104 + 1207771009 = 2152^2 + 34753^2 .

It is not a de Polignac number, because 1212402113 - 2¹⁶ = 1212336577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1212402091 and 1212402100.

It is not an unprimeable number, because it can be changed into a prime (1212402119) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3586820 + ... + 3587157.

It is an arithmetic number, because the mean of its divisors is an integer number (218806329).

Almost surely, 2^1212402113 is an apocalyptic number.

1212402113 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1212402113 is a deficient number, since it is larger than the sum of its proper divisors (100435861).

1212402113 is an equidigital number, since it uses as much as digits as its factorization.

1212402113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7174003 (or 7173990 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1212402113 is about 34819.5650891851. The cubic root of 1212402113 is about 1066.3069213396.

Adding to 1212402113 its reverse (3112042121), we get a palindrome (4324444234).

The spelling of 1212402113 in words is "one billion, two hundred twelve million, four hundred two thousand, one hundred thirteen".