1000021220189 has 2 divisors, whose sum is σ = 1000021220190. Its totient is φ = 1000021220188.

The previous prime is 1000021220171. The next prime is 1000021220227. The reversal of 1000021220189 is 9810221200001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 969913764964 + 30107455225 = 984842^2 + 173515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1000021220189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000021220129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500010610094 + 500010610095.

It is an arithmetic number, because the mean of its divisors is an integer number (500010610095).

Almost surely, 2^{1000021220189} is an apocalyptic number.

It is an amenable number.

1000021220189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000021220189 is an equidigital number, since it uses as much as digits as its factorization.

1000021220189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 1000021220189 in words is "one trillion, twenty-one million, two hundred twenty thousand, one hundred eighty-nine".