1213012210621 has 2 divisors, whose sum is σ = 1213012210622. Its totient is φ = 1213012210620.

The previous prime is 1213012210607. The next prime is 1213012210639. The reversal of 1213012210621 is 1260122103121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1125402722500 + 87609488121 = 1060850^2 + 295989^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213012210621 - 2²³ = 1213003822013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213012210592 and 1213012210601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213012216621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606506105310 + 606506105311.

It is an arithmetic number, because the mean of its divisors is an integer number (606506105311).

Almost surely, 2^{1213012210621} is an apocalyptic number.

It is an amenable number.

1213012210621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213012210621 is an equidigital number, since it uses as much as digits as its factorization.

1213012210621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 1213012210621 its reverse (1260122103121), we get a palindrome (2473134313742).

The spelling of 1213012210621 in words is "one trillion, two hundred thirteen billion, twelve million, two hundred ten thousand, six hundred twenty-one".