201021221000989 has 2 divisors, whose sum is σ = 201021221000990. Its totient is φ = 201021221000988.

The previous prime is 201021221000983. The next prime is 201021221001019. The reversal of 201021221000989 is 989000122120102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127135592295364 + 73885628705625 = 11275442^2 + 8595675^2 .

It is a cyclic number.

It is not a de Polignac number, because 201021221000989 - 2¹⁹ = 201021220476701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201021221000983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510610500494 + 100510610500495.

It is an arithmetic number, because the mean of its divisors is an integer number (100510610500495).

Almost surely, 2^{201021221000989} is an apocalyptic number.

It is an amenable number.

201021221000989 is a deficient number, since it is larger than the sum of its proper divisors (1).

201021221000989 is an equidigital number, since it uses as much as digits as its factorization.

201021221000989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 37.

The spelling of 201021221000989 in words is "two hundred one trillion, twenty-one billion, two hundred twenty-one million, nine hundred eighty-nine", and thus it is an aban number.