21022201321 has 8 divisors (see below), whose sum is σ = 23122843488. Its totient is φ = 19111090900.

The previous prime is 21022201283. The next prime is 21022201349. The reversal of 21022201321 is 12310222012.

It is a happy number.

It is not a de Polignac number, because 21022201321 - 2¹⁵ = 21022168553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21022201295 and 21022201304.

It is not an unprimeable number, because it can be changed into a prime (21022201381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7895815 + ... + 7898476.

It is an arithmetic number, because the mean of its divisors is an integer number (2890355436).

Almost surely, 2^21022201321 is an apocalyptic number.

It is an amenable number.

21022201321 is a deficient number, since it is larger than the sum of its proper divisors (2100642167).

21022201321 is an equidigital number, since it uses as much as digits as its factorization.

21022201321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15794324 (or 15794302 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21022201321 its reverse (12310222012), we get a palindrome (33332423333).

The spelling of 21022201321 in words is "twenty-one billion, twenty-two million, two hundred one thousand, three hundred twenty-one".