21220212330 has 160 divisors (see below), whose sum is σ = 59214976128. Its totient is φ = 5448643200.

The previous prime is 21220212319. The next prime is 21220212341. The reversal of 21220212330 is 3321202212.

21220212330 is a `hidden beast` number, since 2 + 122 + 0 + 212 + 330 = 666.

It is an interprime number because it is at equal distance from previous prime (21220212319) and next prime (21220212341).

It is a super-2 number, since 2×21220212330² (a number of 21 digits) contains 22 as substring.

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 (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2468640 + ... + 2477220.

Almost surely, 2^21220212330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21220212330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29607488064).

21220212330 is an abundant number, since it is smaller than the sum of its proper divisors (37994763798).

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

21220212330 is a wasteful number, since it uses less digits than its factorization.

21220212330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8714 (or 8705 counting only the distinct ones).

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

Adding to 21220212330 its reverse (3321202212), we get a palindrome (24541414542).

The spelling of 21220212330 in words is "twenty-one billion, two hundred twenty million, two hundred twelve thousand, three hundred thirty".