21321223020312 has 128 divisors (see below), whose sum is σ = 58616248320000. Its totient is φ = 6437319419520.

The previous prime is 21321223020277. The next prime is 21321223020313. The reversal of 21321223020312 is 21302032212312.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321223020313) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7912812 + ... + 10259387.

It is an arithmetic number, because the mean of its divisors is an integer number (457939440000).

Almost surely, 2^{21321223020312} is an apocalyptic number.

It is an amenable number.

21321223020312 is an abundant number, since it is smaller than the sum of its proper divisors (37295025299688).

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

21321223020312 is a wasteful number, since it uses less digits than its factorization.

21321223020312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18172341 (or 18172337 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21321223020312 its reverse (21302032212312), we get a palindrome (42623255232624).

The spelling of 21321223020312 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred twenty-three million, twenty thousand, three hundred twelve".