11211020220997 has 2 divisors, whose sum is σ = 11211020220998. Its totient is φ = 11211020220996.

The previous prime is 11211020220977. The next prime is 11211020221003. The reversal of 11211020220997 is 79902202011211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11210483418436 + 536802561 = 3348206^2 + 23169^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211020220997 - 2³⁹ = 10661264407109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211020220937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605510110498 + 5605510110499.

It is an arithmetic number, because the mean of its divisors is an integer number (5605510110499).

Almost surely, 2^{11211020220997} is an apocalyptic number.

It is an amenable number.

11211020220997 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211020220997 is an equidigital number, since it uses as much as digits as its factorization.

11211020220997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 37.

The spelling of 11211020220997 in words is "eleven trillion, two hundred eleven billion, twenty million, two hundred twenty thousand, nine hundred ninety-seven".