21121210032 has 80 divisors (see below), whose sum is σ = 58816235520. Its totient is φ = 6492646656.

The previous prime is 21121210007. The next prime is 21121210037. The reversal of 21121210032 is 23001212112.

It is a super-2 number, since 2×21121210032² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121209993 and 21121210020.

It is not an unprimeable number, because it can be changed into a prime (21121210037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 662719 + ... + 693857.

It is an arithmetic number, because the mean of its divisors is an integer number (735202944).

Almost surely, 2^21121210032 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 21121210032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29408117760).

21121210032 is an abundant number, since it is smaller than the sum of its proper divisors (37695025488).

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

21121210032 is a wasteful number, since it uses less digits than its factorization.

21121210032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32250 (or 32244 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21121210032 its reverse (23001212112), we get a palindrome (44122422144).

The spelling of 21121210032 in words is "twenty-one billion, one hundred twenty-one million, two hundred ten thousand, thirty-two".