10011221989 has 2 divisors, whose sum is σ = 10011221990. Its totient is φ = 10011221988.

The previous prime is 10011221977. The next prime is 10011222043. The reversal of 10011221989 is 98912211001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7179172900 + 2832049089 = 84730^2 + 53217^2 .

It is a cyclic number.

It is not a de Polignac number, because 10011221989 - 2²⁹ = 9474351077 is a prime.

It is a super-2 number, since 2×10011221989² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10011221959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5005610994 + 5005610995.

It is an arithmetic number, because the mean of its divisors is an integer number (5005610995).

Almost surely, 2^10011221989 is an apocalyptic number.

It is an amenable number.

10011221989 is a deficient number, since it is larger than the sum of its proper divisors (1).

10011221989 is an equidigital number, since it uses as much as digits as its factorization.

10011221989 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 10011221989 in words is "ten billion, eleven million, two hundred twenty-one thousand, nine hundred eighty-nine".