21738054321 has 20 divisors (see below), whose sum is σ = 33228084912. Its totient is φ = 14155009848.

The previous prime is 21738054307. The next prime is 21738054347. The reversal of 21738054321 is 12345083712.

21738054321 is a `hidden beast` number, since 2 + 17 + 3 + 80 + 543 + 21 = 666.

It is not a de Polignac number, because 21738054321 - 2²¹ = 21735957169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21738054421) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3117111 + ... + 3124076.

Almost surely, 2^21738054321 is an apocalyptic number.

It is an amenable number.

21738054321 is a deficient number, since it is larger than the sum of its proper divisors (11490030591).

21738054321 is an equidigital number, since it uses as much as digits as its factorization.

21738054321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6241242 (or 6241233 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The spelling of 21738054321 in words is "twenty-one billion, seven hundred thirty-eight million, fifty-four thousand, three hundred twenty-one".