1312234421 has 2 divisors, whose sum is σ = 1312234422. Its totient is φ = 1312234420.

The previous prime is 1312234327. The next prime is 1312234439. The reversal of 1312234421 is 1244322131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 718776100 + 593458321 = 26810^2 + 24361^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312234421 - 2²² = 1308040117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312234481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656117210 + 656117211.

It is an arithmetic number, because the mean of its divisors is an integer number (656117211).

Almost surely, 2^1312234421 is an apocalyptic number.

It is an amenable number.

1312234421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312234421 is an equidigital number, since it uses as much as digits as its factorization.

1312234421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 23.

The square root of 1312234421 is about 36224.7763416146. The cubic root of 1312234421 is about 1094.8059318436.

Adding to 1312234421 its reverse (1244322131), we get a palindrome (2556556552).

The spelling of 1312234421 in words is "one billion, three hundred twelve million, two hundred thirty-four thousand, four hundred twenty-one".