21220330032 has 60 divisors (see below), whose sum is σ = 64786315464. Its totient is φ = 6430402560.

The previous prime is 21220330013. The next prime is 21220330057. The reversal of 21220330032 is 23003302212.

It is a happy number.

It is a super-2 number, since 2×21220330032² (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 a junction number, because it is equal to n+sod(n) for n = 21220329987 and 21220330014.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6696753 + ... + 6699920.

Almost surely, 2^21220330032 is an apocalyptic number.

21220330032 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21220330032 is an abundant number, since it is smaller than the sum of its proper divisors (43565985432).

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

21220330032 is a wasteful number, since it uses less digits than its factorization.

21220330032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13396698 (or 13396689 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 21220330032 its reverse (23003302212), we get a palindrome (44223632244).

The spelling of 21220330032 in words is "twenty-one billion, two hundred twenty million, three hundred thirty thousand, thirty-two".