1100021220997 has 2 divisors, whose sum is σ = 1100021220998. Its totient is φ = 1100021220996.

The previous prime is 1100021220979. The next prime is 1100021221043. The reversal of 1100021220997 is 7990221200011.

It is a happy number.

Together with previous prime (1100021220979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1055696655841 + 44324565156 = 1027471^2 + 210534^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100021220997 - 2¹¹ = 1100021218949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1100021280997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550010610498 + 550010610499.

It is an arithmetic number, because the mean of its divisors is an integer number (550010610499).

Almost surely, 2^{1100021220997} is an apocalyptic number.

It is an amenable number.

1100021220997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100021220997 is an equidigital number, since it uses as much as digits as its factorization.

1100021220997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 34.

The spelling of 1100021220997 in words is "one trillion, one hundred billion, twenty-one million, two hundred twenty thousand, nine hundred ninety-seven".