19497245881021 has 2 divisors, whose sum is σ = 19497245881022. Its totient is φ = 19497245881020.

The previous prime is 19497245880997. The next prime is 19497245881073. The reversal of 19497245881021 is 12018854279491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19466361684900 + 30884196121 = 4412070^2 + 175739^2 .

It is a cyclic number.

It is not a de Polignac number, because 19497245881021 - 2⁵ = 19497245880989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19497245882021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9748622940510 + 9748622940511.

It is an arithmetic number, because the mean of its divisors is an integer number (9748622940511).

Almost surely, 2^{19497245881021} is an apocalyptic number.

It is an amenable number.

19497245881021 is a deficient number, since it is larger than the sum of its proper divisors (1).

19497245881021 is an equidigital number, since it uses as much as digits as its factorization.

19497245881021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11612160, while the sum is 61.

The spelling of 19497245881021 in words is "nineteen trillion, four hundred ninety-seven billion, two hundred forty-five million, eight hundred eighty-one thousand, twenty-one".