21311230032220 has 24 divisors (see below), whose sum is σ = 45963139368384. Its totient is φ = 8294100336576.

The previous prime is 21311230032133. The next prime is 21311230032221. The reversal of 21311230032220 is 2223003211312.

It is a junction number, because it is equal to n+sod(n) for n = 21311230032191 and 21311230032200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311230032221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14399479012 + ... + 14399480491.

It is an arithmetic number, because the mean of its divisors is an integer number (1915130807016).

Almost surely, 2^{21311230032220} is an apocalyptic number.

21311230032220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21311230032220 is an abundant number, since it is smaller than the sum of its proper divisors (24651909336164).

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

21311230032220 is a wasteful number, since it uses less digits than its factorization.

21311230032220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28798959549 (or 28798959547 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21311230032220 its reverse (2223003211312), we get a palindrome (23534233243532).

The spelling of 21311230032220 in words is "twenty-one trillion, three hundred eleven billion, two hundred thirty million, thirty-two thousand, two hundred twenty".