21210320322 has 12 divisors (see below), whose sum is σ = 45955694070. Its totient is φ = 7070106768.

The previous prime is 21210320321. The next prime is 21210320347. The reversal of 21210320322 is 22302301212.

21210320322 is a `hidden beast` number, since 2 + 1 + 21 + 0 + 320 + 322 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20480185881 + 730134441 = 143109^2 + 27021^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1178351129 = 21210320322 / (2 + 1 + 2 + 1 + 0 + 3 + 2 + 0 + 3 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21210320295 and 21210320304.

It is not an unprimeable number, because it can be changed into a prime (21210320321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 589175547 + ... + 589175582.

Almost surely, 2^21210320322 is an apocalyptic number.

21210320322 is an abundant number, since it is smaller than the sum of its proper divisors (24745373748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21210320322 is a wasteful number, since it uses less digits than its factorization.

21210320322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178351137 (or 1178351134 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21210320322 its reverse (22302301212), we get a palindrome (43512621534).

The spelling of 21210320322 in words is "twenty-one billion, two hundred ten million, three hundred twenty thousand, three hundred twenty-two".