21221301232 has 40 divisors (see below), whose sum is σ = 42563280240. Its totient is φ = 10237731840.

The previous prime is 21221301113. The next prime is 21221301239. The reversal of 21221301232 is 23210312212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221301239) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 695448 + ... + 725320.

It is an arithmetic number, because the mean of its divisors is an integer number (1064082006).

Almost surely, 2^21221301232 is an apocalyptic number.

It is an amenable number.

21221301232 is an abundant number, since it is smaller than the sum of its proper divisors (21341979008).

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

21221301232 is a wasteful number, since it uses less digits than its factorization.

21221301232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31441 (or 31435 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21221301232 its reverse (23210312212), we get a palindrome (44431613444).

The spelling of 21221301232 in words is "twenty-one billion, two hundred twenty-one million, three hundred one thousand, two hundred thirty-two".