20211000999989 has 2 divisors, whose sum is σ = 20211000999990. Its totient is φ = 20211000999988.

The previous prime is 20211000999949. The next prime is 20211001000087. The reversal of 20211000999989 is 98999900011202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14285754122500 + 5925246877489 = 3779650^2 + 2434183^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20211000999989 is a prime.

It is a super-2 number, since 2×20211000999989² (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 (20211000999929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105500499994 + 10105500499995.

It is an arithmetic number, because the mean of its divisors is an integer number (10105500499995).

Almost surely, 2^{20211000999989} is an apocalyptic number.

It is an amenable number.

20211000999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211000999989 is an equidigital number, since it uses as much as digits as its factorization.

20211000999989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1889568, while the sum is 59.

The spelling of 20211000999989 in words is "twenty trillion, two hundred eleven billion, nine hundred ninety-nine thousand, nine hundred eighty-nine".