21489363829 has 16 divisors (see below), whose sum is σ = 22553307648. Its totient is φ = 20451388032.

The previous prime is 21489363823. The next prime is 21489363881. The reversal of 21489363829 is 92836398412.

It is a cyclic number.

It is not a de Polignac number, because 21489363829 - 2¹³ = 21489355637 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21489363829.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21489363823) 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, 4350249 + ... + 4355185.

It is an arithmetic number, because the mean of its divisors is an integer number (1409581728).

Almost surely, 2^21489363829 is an apocalyptic number.

It is an amenable number.

21489363829 is a deficient number, since it is larger than the sum of its proper divisors (1063943819).

21489363829 is a wasteful number, since it uses less digits than its factorization.

21489363829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7524.

The product of its digits is 4478976, while the sum is 55.

The spelling of 21489363829 in words is "twenty-one billion, four hundred eighty-nine million, three hundred sixty-three thousand, eight hundred twenty-nine".