31212341420221 has 32 divisors (see below), whose sum is σ = 34409467749888. Its totient is φ = 28131906493440.

The previous prime is 31212341420209. The next prime is 31212341420243. The reversal of 31212341420221 is 12202414321213.

It is a cyclic number.

It is not a de Polignac number, because 31212341420221 - 2⁵ = 31212341420189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31212341420221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212341420921) 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, 611250031 + ... + 611301091.

It is an arithmetic number, because the mean of its divisors is an integer number (1075295867184).

Almost surely, 2^{31212341420221} is an apocalyptic number.

It is an amenable number.

31212341420221 is a deficient number, since it is larger than the sum of its proper divisors (3197126329667).

31212341420221 is a wasteful number, since it uses less digits than its factorization.

31212341420221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53461.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 31212341420221 its reverse (12202414321213), we get a palindrome (43414755741434).

The spelling of 31212341420221 in words is "thirty-one trillion, two hundred twelve billion, three hundred forty-one million, four hundred twenty thousand, two hundred twenty-one".