1235402021197 has 2 divisors, whose sum is σ = 1235402021198. Its totient is φ = 1235402021196.

The previous prime is 1235402021143. The next prime is 1235402021219. The reversal of 1235402021197 is 7911202045321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 906810534756 + 328591486441 = 952266^2 + 573229^2 .

It is an emirp because it is prime and its reverse (7911202045321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1235402021197 - 2¹⁹ = 1235401496909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1235402025197) 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, 617701010598 + 617701010599.

It is an arithmetic number, because the mean of its divisors is an integer number (617701010599).

Almost surely, 2^{1235402021197} is an apocalyptic number.

It is an amenable number.

1235402021197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1235402021197 is an equidigital number, since it uses as much as digits as its factorization.

1235402021197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 1235402021197 in words is "one trillion, two hundred thirty-five billion, four hundred two million, twenty-one thousand, one hundred ninety-seven".