21322230321 has 16 divisors (see below), whose sum is σ = 32557206528. Its totient is φ = 12159310800.

The previous prime is 21322230317. The next prime is 21322230329. The reversal of 21322230321 is 12303222312.

It is a happy number.

It is not a de Polignac number, because 21322230321 - 2² = 21322230317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21322230329) 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, 1023645 + ... + 1044266.

It is an arithmetic number, because the mean of its divisors is an integer number (2034825408).

Almost surely, 2^21322230321 is an apocalyptic number.

21322230321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21322230321 is a deficient number, since it is larger than the sum of its proper divisors (11234976207).

21322230321 is a wasteful number, since it uses less digits than its factorization.

21322230321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2068412.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21322230321 its reverse (12303222312), we get a palindrome (33625452633).

The spelling of 21322230321 in words is "twenty-one billion, three hundred twenty-two million, two hundred thirty thousand, three hundred twenty-one".