21220301232 has 120 divisors (see below), whose sum is σ = 64765646400. Its totient is φ = 6446628864.

The previous prime is 21220301231. The next prime is 21220301233. The reversal of 21220301232 is 23210302212.

It is an interprime number because it is at equal distance from previous prime (21220301231) and next prime (21220301233).

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

It is not an unprimeable number, because it can be changed into a prime (21220301231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76144 + ... + 219632.

It is an arithmetic number, because the mean of its divisors is an integer number (539713720).

Almost surely, 2^21220301232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21220301232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32382823200).

21220301232 is an abundant number, since it is smaller than the sum of its proper divisors (43545345168).

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

21220301232 is a wasteful number, since it uses less digits than its factorization.

21220301232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143595 (or 143586 counting only the distinct ones).

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

Adding to 21220301232 its reverse (23210302212), we get a palindrome (44430603444).

The spelling of 21220301232 in words is "twenty-one billion, two hundred twenty million, three hundred one thousand, two hundred thirty-two".