21212320031012 has 24 divisors (see below), whose sum is σ = 42878379529440. Its totient is φ = 9074789317760.

The previous prime is 21212320030949. The next prime is 21212320031051. The reversal of 21212320031012 is 21013002321212.

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, 14179357562 + ... + 14179359057.

It is an arithmetic number, because the mean of its divisors is an integer number (1786599147060).

Almost surely, 2^{21212320031012} is an apocalyptic number.

21212320031012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21212320031012 is an abundant number, since it is smaller than the sum of its proper divisors (21666059498428).

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

21212320031012 is a wasteful number, since it uses less digits than its factorization.

21212320031012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28358716651 (or 28358716649 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21212320031012 its reverse (21013002321212), we get a palindrome (42225322352224).

The spelling of 21212320031012 in words is "twenty-one trillion, two hundred twelve billion, three hundred twenty million, thirty-one thousand, twelve".