21001231222032 has 20 divisors (see below), whose sum is σ = 54253180657040. Its totient is φ = 7000410407328.

The previous prime is 21001231222003. The next prime is 21001231222033. The reversal of 21001231222032 is 23022213210012.

It is not an unprimeable number, because it can be changed into a prime (21001231222033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218762825182 + ... + 218762825277.

It is an arithmetic number, because the mean of its divisors is an integer number (2712659032852).

Almost surely, 2^{21001231222032} is an apocalyptic number.

It is an amenable number.

21001231222032 is an abundant number, since it is smaller than the sum of its proper divisors (33251949435008).

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

21001231222032 is a wasteful number, since it uses less digits than its factorization.

21001231222032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437525650470 (or 437525650464 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21001231222032 its reverse (23022213210012), we get a palindrome (44023444432044).

The spelling of 21001231222032 in words is "twenty-one trillion, one billion, two hundred thirty-one million, two hundred twenty-two thousand, thirty-two".