1109646571021 has 2 divisors, whose sum is σ = 1109646571022. Its totient is φ = 1109646571020.

The previous prime is 1109646570997. The next prime is 1109646571037. The reversal of 1109646571021 is 1201756469011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1064324418921 + 45322152100 = 1031661^2 + 212890^2 .

It is a cyclic number.

It is not a de Polignac number, because 1109646571021 - 2²⁹ = 1109109700109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1109646571321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 554823285510 + 554823285511.

It is an arithmetic number, because the mean of its divisors is an integer number (554823285511).

Almost surely, 2^{1109646571021} is an apocalyptic number.

It is an amenable number.

1109646571021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1109646571021 is an equidigital number, since it uses as much as digits as its factorization.

1109646571021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 43.

The spelling of 1109646571021 in words is "one trillion, one hundred nine billion, six hundred forty-six million, five hundred seventy-one thousand, twenty-one".