21738282137 has 8 divisors (see below), whose sum is σ = 25538681280. Its totient is φ = 18241914960.

The previous prime is 21738282131. The next prime is 21738282161. The reversal of 21738282137 is 73128283712.

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 21738282137 - 2⁴ = 21738282121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21738282131) 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, 76007837 + ... + 76008122.

It is an arithmetic number, because the mean of its divisors is an integer number (3192335160).

Almost surely, 2^21738282137 is an apocalyptic number.

It is an amenable number.

21738282137 is a deficient number, since it is larger than the sum of its proper divisors (3800399143).

21738282137 is a wasteful number, since it uses less digits than its factorization.

21738282137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152015983.

The product of its digits is 225792, while the sum is 44.

The spelling of 21738282137 in words is "twenty-one billion, seven hundred thirty-eight million, two hundred eighty-two thousand, one hundred thirty-seven".