21645262382 has 16 divisors (see below), whose sum is σ = 33605260560. Its totient is φ = 10443904128.

The previous prime is 21645262369. The next prime is 21645262391. The reversal of 21645262382 is 28326254612.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12758 + ... + 208454.

It is an arithmetic number, because the mean of its divisors is an integer number (2100328785).

Almost surely, 2^21645262382 is an apocalyptic number.

21645262382 is a deficient number, since it is larger than the sum of its proper divisors (11959998178).

21645262382 is a wasteful number, since it uses less digits than its factorization.

21645262382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197635.

The product of its digits is 276480, while the sum is 41.

The spelling of 21645262382 in words is "twenty-one billion, six hundred forty-five million, two hundred sixty-two thousand, three hundred eighty-two".