21945839403 has 8 divisors (see below), whose sum is σ = 29261922768. Its totient is φ = 14630157824.

The previous prime is 21945839371. The next prime is 21945839423. The reversal of 21945839403 is 30493854912.

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 21945839403 - 2⁵ = 21945839371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21945839423) 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, 66775 + ... + 219887.

It is an arithmetic number, because the mean of its divisors is an integer number (3657740346).

Almost surely, 2^21945839403 is an apocalyptic number.

21945839403 is a deficient number, since it is larger than the sum of its proper divisors (7316083365).

21945839403 is a wasteful number, since it uses less digits than its factorization.

21945839403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200893.

The product of its (nonzero) digits is 933120, while the sum is 48.

The spelling of 21945839403 in words is "twenty-one billion, nine hundred forty-five million, eight hundred thirty-nine thousand, four hundred three".