21212312021332 has 24 divisors (see below), whose sum is σ = 37171223998272. Its totient is φ = 10591962984000.

The previous prime is 21212312021323. The next prime is 21212312021347. The reversal of 21212312021332 is 23312021321212.

It is a junction number, because it is equal to n+sod(n) for n = 21212312021297 and 21212312021306.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223232943 + ... + 223327945.

It is an arithmetic number, because the mean of its divisors is an integer number (1548800999928).

Almost surely, 2^{21212312021332} is an apocalyptic number.

It is an amenable number.

21212312021332 is a deficient number, since it is larger than the sum of its proper divisors (15958911976940).

21212312021332 is a wasteful number, since it uses less digits than its factorization.

21212312021332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169119 (or 169117 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21212312021332 its reverse (23312021321212), we get a palindrome (44524333342544).

The spelling of 21212312021332 in words is "twenty-one trillion, two hundred twelve billion, three hundred twelve million, twenty-one thousand, three hundred thirty-two".