101021201989 has 2 divisors, whose sum is σ = 101021201990. Its totient is φ = 101021201988.

The previous prime is 101021201977. The next prime is 101021202013. The reversal of 101021201989 is 989102120101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100906604964 + 114597025 = 317658^2 + 10705^2 .

It is a cyclic number.

It is not a de Polignac number, because 101021201989 - 2¹¹ = 101021199941 is a prime.

It is a super-2 number, since 2×101021201989² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101021201089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50510600994 + 50510600995.

It is an arithmetic number, because the mean of its divisors is an integer number (50510600995).

Almost surely, 2^101021201989 is an apocalyptic number.

It is an amenable number.

101021201989 is a deficient number, since it is larger than the sum of its proper divisors (1).

101021201989 is an equidigital number, since it uses as much as digits as its factorization.

101021201989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 34.

The spelling of 101021201989 in words is "one hundred one billion, twenty-one million, two hundred one thousand, nine hundred eighty-nine".