21802192321 has 16 divisors (see below), whose sum is σ = 26839007104. Its totient is φ = 17246525184.

The previous prime is 21802192289. The next prime is 21802192327. The reversal of 21802192321 is 12329120812.

It is not a de Polignac number, because 21802192321 - 2⁵ = 21802192289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21802192327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 473305 + ... + 517321.

It is an arithmetic number, because the mean of its divisors is an integer number (1677437944).

Almost surely, 2^21802192321 is an apocalyptic number.

It is an amenable number.

21802192321 is a deficient number, since it is larger than the sum of its proper divisors (5036814783).

21802192321 is a wasteful number, since it uses less digits than its factorization.

21802192321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49480.

The product of its (nonzero) digits is 3456, while the sum is 31.

The spelling of 21802192321 in words is "twenty-one billion, eight hundred two million, one hundred ninety-two thousand, three hundred twenty-one".