19436280970721 has 2 divisors, whose sum is σ = 19436280970722. Its totient is φ = 19436280970720.

The previous prime is 19436280970709. The next prime is 19436280970727. The reversal of 19436280970721 is 12707908263491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19232215557025 + 204065413696 = 4385455^2 + 451736^2 .

It is a cyclic number.

It is not a de Polignac number, because 19436280970721 - 2³⁴ = 19419101101537 is a prime.

It is a super-2 number, since 2×19436280970721² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19436280970727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9718140485360 + 9718140485361.

It is an arithmetic number, because the mean of its divisors is an integer number (9718140485361).

Almost surely, 2^{19436280970721} is an apocalyptic number.

It is an amenable number.

19436280970721 is a deficient number, since it is larger than the sum of its proper divisors (1).

19436280970721 is an equidigital number, since it uses as much as digits as its factorization.

19436280970721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9144576, while the sum is 59.

The spelling of 19436280970721 in words is "nineteen trillion, four hundred thirty-six billion, two hundred eighty million, nine hundred seventy thousand, seven hundred twenty-one".