21267362544 has 80 divisors (see below), whose sum is σ = 55593417984. Its totient is φ = 7005196800.

The previous prime is 21267362537. The next prime is 21267362569. The reversal of 21267362544 is 44526376212.

It is a junction number, because it is equal to n+sod(n) for n = 21267362496 and 21267362505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2423124 + ... + 2431884.

Almost surely, 2^21267362544 is an apocalyptic number.

21267362544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21267362544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27796708992).

21267362544 is an abundant number, since it is smaller than the sum of its proper divisors (34326055440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21267362544 is a wasteful number, since it uses less digits than its factorization.

21267362544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9366 (or 9360 counting only the distinct ones).

The product of its digits is 483840, while the sum is 42.

The spelling of 21267362544 in words is "twenty-one billion, two hundred sixty-seven million, three hundred sixty-two thousand, five hundred forty-four".