21202122330 has 128 divisors (see below), whose sum is σ = 58556528640. Its totient is φ = 5453360640.

The previous prime is 21202122317. The next prime is 21202122341. The reversal of 21202122330 is 3322120212.

21202122330 is a `hidden beast` number, since 2 + 120 + 212 + 2 + 330 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2615764 + ... + 2623856.

It is an arithmetic number, because the mean of its divisors is an integer number (457472880).

Almost surely, 2^21202122330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21202122330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29278264320).

21202122330 is an abundant number, since it is smaller than the sum of its proper divisors (37354406310).

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

21202122330 is a wasteful number, since it uses less digits than its factorization.

21202122330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8453 (or 8447 counting only the distinct ones).

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

Adding to 21202122330 its reverse (3322120212), we get a palindrome (24524242542).

The spelling of 21202122330 in words is "twenty-one billion, two hundred two million, one hundred twenty-two thousand, three hundred thirty".