21540402322 has 8 divisors (see below), whose sum is σ = 32333250096. Its totient is φ = 10762652292.

The previous prime is 21540402311. The next prime is 21540402337. The reversal of 21540402322 is 22320404512.

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

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, 3770868 + ... + 3776575.

It is an arithmetic number, because the mean of its divisors is an integer number (4041656262).

Almost surely, 2^21540402322 is an apocalyptic number.

21540402322 is a deficient number, since it is larger than the sum of its proper divisors (10792847774).

21540402322 is a wasteful number, since it uses less digits than its factorization.

21540402322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7548872.

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 21540402322 its reverse (22320404512), we get a palindrome (43860806834).

The spelling of 21540402322 in words is "twenty-one billion, five hundred forty million, four hundred two thousand, three hundred twenty-two".