1213021957969 has 2 divisors, whose sum is σ = 1213021957970. Its totient is φ = 1213021957968.

The previous prime is 1213021957951. The next prime is 1213021957997. The reversal of 1213021957969 is 9697591203121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1143701913600 + 69320044369 = 1069440^2 + 263287^2 .

It is an emirp because it is prime and its reverse (9697591203121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1213021957969 - 2⁵ = 1213021957937 is a prime.

It is a super-2 number, since 2×1213021957969² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1213021357969) 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, 606510978984 + 606510978985.

It is an arithmetic number, because the mean of its divisors is an integer number (606510978985).

Almost surely, 2^{1213021957969} is an apocalyptic number.

It is an amenable number.

1213021957969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213021957969 is an equidigital number, since it uses as much as digits as its factorization.

1213021957969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1837080, while the sum is 55.

The spelling of 1213021957969 in words is "one trillion, two hundred thirteen billion, twenty-one million, nine hundred fifty-seven thousand, nine hundred sixty-nine".