21762887321 has 4 divisors (see below), whose sum is σ = 24871871232. Its totient is φ = 18653903412.

The previous prime is 21762887287. The next prime is 21762887351. The reversal of 21762887321 is 12378826712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21762887321 - 2³⁴ = 4583018137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21762887351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1554491945 + ... + 1554491958.

It is an arithmetic number, because the mean of its divisors is an integer number (6217967808).

Almost surely, 2^21762887321 is an apocalyptic number.

It is an amenable number.

21762887321 is a deficient number, since it is larger than the sum of its proper divisors (3108983911).

21762887321 is an equidigital number, since it uses as much as digits as its factorization.

21762887321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3108983910.

The product of its digits is 451584, while the sum is 47.

The spelling of 21762887321 in words is "twenty-one billion, seven hundred sixty-two million, eight hundred eighty-seven thousand, three hundred twenty-one".