21037024891 has 8 divisors (see below), whose sum is σ = 21602335040. Its totient is φ = 20475172872.

The previous prime is 21037024889. The next prime is 21037024909. The reversal of 21037024891 is 19842073012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21037024891 - 2¹ = 21037024889 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 21037024891.

It is not an unprimeable number, because it can be changed into a prime (21037024871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 852201 + ... + 876538.

It is an arithmetic number, because the mean of its divisors is an integer number (2700291880).

Almost surely, 2^21037024891 is an apocalyptic number.

21037024891 is a deficient number, since it is larger than the sum of its proper divisors (565310149).

21037024891 is a wasteful number, since it uses less digits than its factorization.

21037024891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1729065.

The product of its (nonzero) digits is 24192, while the sum is 37.

The spelling of 21037024891 in words is "twenty-one billion, thirty-seven million, twenty-four thousand, eight hundred ninety-one".