21645132022 has 8 divisors (see below), whose sum is σ = 32476206672. Its totient is φ = 10819729800.

The previous prime is 21645132011. The next prime is 21645132049. The reversal of 21645132022 is 22023154612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1408554 + ... + 1423837.

It is an arithmetic number, because the mean of its divisors is an integer number (4059525834).

Almost surely, 2^21645132022 is an apocalyptic number.

21645132022 is a deficient number, since it is larger than the sum of its proper divisors (10831074650).

21645132022 is a wasteful number, since it uses less digits than its factorization.

21645132022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2836214.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 21645132022 its reverse (22023154612), we get a palindrome (43668286634).

The spelling of 21645132022 in words is "twenty-one billion, six hundred forty-five million, one hundred thirty-two thousand, twenty-two".