21267369489 has 16 divisors (see below), whose sum is σ = 29122853760. Its totient is φ = 13796845440.

The previous prime is 21267369437. The next prime is 21267369491. The reversal of 21267369489 is 98496376212.

It is not a de Polignac number, because 21267369489 - 2¹⁵ = 21267336721 is a prime.

It is a super-2 number, since 2×21267369489² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21267369089) 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, 174397 + ... + 270090.

It is an arithmetic number, because the mean of its divisors is an integer number (1820178360).

Almost surely, 2^21267369489 is an apocalyptic number.

It is an amenable number.

21267369489 is a deficient number, since it is larger than the sum of its proper divisors (7855484271).

21267369489 is a wasteful number, since it uses less digits than its factorization.

21267369489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444920.

The product of its digits is 7838208, while the sum is 57.

The spelling of 21267369489 in words is "twenty-one billion, two hundred sixty-seven million, three hundred sixty-nine thousand, four hundred eighty-nine".