1321212310421 has 2 divisors, whose sum is σ = 1321212310422. Its totient is φ = 1321212310420.

The previous prime is 1321212310409. The next prime is 1321212310433. The reversal of 1321212310421 is 1240132121231.

It is a balanced prime because it is at equal distance from previous prime (1321212310409) and next prime (1321212310433).

It can be written as a sum of positive squares in only one way, i.e., 1245746176900 + 75466133521 = 1116130^2 + 274711^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321212310421 - 2¹⁴ = 1321212294037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321212310471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660606155210 + 660606155211.

It is an arithmetic number, because the mean of its divisors is an integer number (660606155211).

Almost surely, 2^{1321212310421} is an apocalyptic number.

It is an amenable number.

1321212310421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321212310421 is an equidigital number, since it uses as much as digits as its factorization.

1321212310421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 1321212310421 its reverse (1240132121231), we get a palindrome (2561344431652).

The spelling of 1321212310421 in words is "one trillion, three hundred twenty-one billion, two hundred twelve million, three hundred ten thousand, four hundred twenty-one".