21890336735 has 16 divisors (see below), whose sum is σ = 26443812864. Its totient is φ = 17395674912.

The previous prime is 21890336731. The next prime is 21890336759. The reversal of 21890336735 is 53763309812.

It is a cyclic number.

It is not a de Polignac number, because 21890336735 - 2² = 21890336731 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 21890336735.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21890336731) by changing a digit.

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, 495044 + ... + 537446.

It is an arithmetic number, because the mean of its divisors is an integer number (1652738304).

Almost surely, 2^21890336735 is an apocalyptic number.

21890336735 is a deficient number, since it is larger than the sum of its proper divisors (4553476129).

21890336735 is a wasteful number, since it uses less digits than its factorization.

21890336735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43094.

The product of its (nonzero) digits is 816480, while the sum is 47.

The spelling of 21890336735 in words is "twenty-one billion, eight hundred ninety million, three hundred thirty-six thousand, seven hundred thirty-five".