21703661421 has 8 divisors (see below), whose sum is σ = 31164231840. Its totient is φ = 13356099312.

The previous prime is 21703661401. The next prime is 21703661429. The reversal of 21703661421 is 12416630712.

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

It is not a de Polignac number, because 21703661421 - 2¹⁰ = 21703660397 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21703661429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278252031 + ... + 278252108.

It is an arithmetic number, because the mean of its divisors is an integer number (3895528980).

Almost surely, 2^21703661421 is an apocalyptic number.

It is an amenable number.

21703661421 is a deficient number, since it is larger than the sum of its proper divisors (9460570419).

21703661421 is a wasteful number, since it uses less digits than its factorization.

21703661421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556504155.

The product of its (nonzero) digits is 12096, while the sum is 33.

The spelling of 21703661421 in words is "twenty-one billion, seven hundred three million, six hundred sixty-one thousand, four hundred twenty-one".