21211000989 has 16 divisors (see below), whose sum is σ = 29094766272. Its totient is φ = 13735243008.

The previous prime is 21211000973. The next prime is 21211001027. The reversal of 21211000989 is 98900011212.

It is not a de Polignac number, because 21211000989 - 2⁴ = 21211000973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211000289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95299 + ... + 226944.

It is an arithmetic number, because the mean of its divisors is an integer number (1818422892).

Almost surely, 2^21211000989 is an apocalyptic number.

It is an amenable number.

21211000989 is a deficient number, since it is larger than the sum of its proper divisors (7883765283).

21211000989 is a wasteful number, since it uses less digits than its factorization.

21211000989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322876.

The product of its (nonzero) digits is 2592, while the sum is 33.

The spelling of 21211000989 in words is "twenty-one billion, two hundred eleven million, nine hundred eighty-nine", and thus it is an aban number.