20010100199989 has 2 divisors, whose sum is σ = 20010100199990. Its totient is φ = 20010100199988.

The previous prime is 20010100199911. The next prime is 20010100200023. The reversal of 20010100199989 is 98999100101002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19588856364900 + 421243835089 = 4425930^2 + 649033^2 .

It is a cyclic number.

It is not a de Polignac number, because 20010100199989 - 2²¹ = 20010098102837 is a prime.

It is a super-2 number, since 2×20010100199989² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20010100193989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005050099994 + 10005050099995.

It is an arithmetic number, because the mean of its divisors is an integer number (10005050099995).

Almost surely, 2^{20010100199989} is an apocalyptic number.

It is an amenable number.

20010100199989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010100199989 is an equidigital number, since it uses as much as digits as its factorization.

20010100199989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 49.

The spelling of 20010100199989 in words is "twenty trillion, ten billion, one hundred million, one hundred ninety-nine thousand, nine hundred eighty-nine".