21299999999989 has 2 divisors, whose sum is σ = 21299999999990. Its totient is φ = 21299999999988.

The previous prime is 21299999999977. The next prime is 21300000000023. The reversal of 21299999999989 is 98999999999212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21281383580625 + 18616419364 = 4613175^2 + 136442^2 .

It is a cyclic number.

It is not a de Polignac number, because 21299999999989 - 2¹³ = 21299999991797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21299999999969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10649999999994 + 10649999999995.

It is an arithmetic number, because the mean of its divisors is an integer number (10649999999995).

Almost surely, 2^{21299999999989} is an apocalyptic number.

It is an amenable number.

21299999999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

21299999999989 is an equidigital number, since it uses as much as digits as its factorization.

21299999999989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 111577100832, while the sum is 103.

The spelling of 21299999999989 in words is "twenty-one trillion, two hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-nine".