21213002312312 has 16 divisors (see below), whose sum is σ = 39778109625840. Its totient is φ = 10605506412096.

The previous prime is 21213002312273. The next prime is 21213002312321. The reversal of 21213002312312 is 21321320031212.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 124252373 + ... + 124422980.

It is an arithmetic number, because the mean of its divisors is an integer number (2486131851615).

Almost surely, 2^{21213002312312} is an apocalyptic number.

It is an amenable number.

21213002312312 is a deficient number, since it is larger than the sum of its proper divisors (18565107313528).

21213002312312 is a wasteful number, since it uses less digits than its factorization.

21213002312312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248686022 (or 248686018 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21213002312312 its reverse (21321320031212), we get a palindrome (42534322343524).

The spelling of 21213002312312 in words is "twenty-one trillion, two hundred thirteen billion, two million, three hundred twelve thousand, three hundred twelve".