21321212111320 has 64 divisors (see below), whose sum is σ = 52341107588640. Its totient is φ = 7752097920000.

The previous prime is 21321212111231. The next prime is 21321212111321. The reversal of 21321212111320 is 2311121212312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21321212111291 and 21321212111300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321212111321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149181 + ... + 6531820.

Almost surely, 2^{21321212111320} is an apocalyptic number.

21321212111320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21321212111320 is an abundant number, since it is smaller than the sum of its proper divisors (31019895477320).

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

21321212111320 is a wasteful number, since it uses less digits than its factorization.

21321212111320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6688276 (or 6688272 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21321212111320 its reverse (2311121212312), we get a palindrome (23632333323632).

The spelling of 21321212111320 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred twelve million, one hundred eleven thousand, three hundred twenty".