21320221330 has 16 divisors (see below), whose sum is σ = 38450066904. Its totient is φ = 8511717760.

The previous prime is 21320221327. The next prime is 21320221337. The reversal of 21320221330 is 3312202312.

It can be written as a sum of positive squares in 4 ways, for example, as 16337696761 + 4982524569 = 127819^2 + 70587^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21320221298 and 21320221307.

It is not an unprimeable number, because it can be changed into a prime (21320221337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2040877 + ... + 2051296.

Almost surely, 2^21320221330 is an apocalyptic number.

21320221330 is a deficient number, since it is larger than the sum of its proper divisors (17129845574).

21320221330 is a wasteful number, since it uses less digits than its factorization.

21320221330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4092701.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21320221330 its reverse (3312202312), we get a palindrome (24632423642).

The spelling of 21320221330 in words is "twenty-one billion, three hundred twenty million, two hundred twenty-one thousand, three hundred thirty".