21231430989 has 16 divisors (see below), whose sum is σ = 28683525120. Its totient is φ = 13967020080.

The previous prime is 21231430981. The next prime is 21231430999. The reversal of 21231430989 is 98903413212.

It is not a de Polignac number, because 21231430989 - 2³ = 21231430981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21231430989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231430981) 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, 398454 + ... + 448584.

It is an arithmetic number, because the mean of its divisors is an integer number (1792720320).

Almost surely, 2^21231430989 is an apocalyptic number.

It is an amenable number.

21231430989 is a deficient number, since it is larger than the sum of its proper divisors (7452094131).

21231430989 is a wasteful number, since it uses less digits than its factorization.

21231430989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52000.

The product of its (nonzero) digits is 93312, while the sum is 42.

The spelling of 21231430989 in words is "twenty-one billion, two hundred thirty-one million, four hundred thirty thousand, nine hundred eighty-nine".