21286885537 has 8 divisors (see below), whose sum is σ = 22000349952. Its totient is φ = 20575095600.

The previous prime is 21286885531. The next prime is 21286885553. The reversal of 21286885537 is 73558868212.

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 21286885537 - 2³¹ = 19139401889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21286885531) 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, 392743 + ... + 443644.

It is an arithmetic number, because the mean of its divisors is an integer number (2750043744).

Almost surely, 2^21286885537 is an apocalyptic number.

It is an amenable number.

21286885537 is a deficient number, since it is larger than the sum of its proper divisors (713464415).

21286885537 is an equidigital number, since it uses as much as digits as its factorization.

21286885537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837239.

The product of its digits is 6451200, while the sum is 55.

The spelling of 21286885537 in words is "twenty-one billion, two hundred eighty-six million, eight hundred eighty-five thousand, five hundred thirty-seven".