21903731893 has 8 divisors (see below), whose sum is σ = 22139109440. Its totient is φ = 21668549760.

The previous prime is 21903731881. The next prime is 21903731917. The reversal of 21903731893 is 39813730912.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21903731893 is a prime.

It is a super-3 number, since 3×21903731893³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21903731093) 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, 182368 + ... + 277606.

It is an arithmetic number, because the mean of its divisors is an integer number (2767388680).

Almost surely, 2^21903731893 is an apocalyptic number.

It is an amenable number.

21903731893 is a deficient number, since it is larger than the sum of its proper divisors (235377547).

21903731893 is an equidigital number, since it uses as much as digits as its factorization.

21903731893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97707.

The product of its (nonzero) digits is 244944, while the sum is 46.

The spelling of 21903731893 in words is "twenty-one billion, nine hundred three million, seven hundred thirty-one thousand, eight hundred ninety-three".