31212113200221 has 8 divisors (see below), whose sum is σ = 42740911769824. Its totient is φ = 20245695048720.

The previous prime is 31212113200199. The next prime is 31212113200237. The reversal of 31212113200221 is 12200231121213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31212113200221 - 2⁶ = 31212113200157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212113200271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140595104395 + ... + 140595104616.

It is an arithmetic number, because the mean of its divisors is an integer number (5342613971228).

Almost surely, 2^{31212113200221} is an apocalyptic number.

It is an amenable number.

31212113200221 is a deficient number, since it is larger than the sum of its proper divisors (11528798569603).

31212113200221 is a wasteful number, since it uses less digits than its factorization.

31212113200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281190209051.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 31212113200221 its reverse (12200231121213), we get a palindrome (43412344321434).

The spelling of 31212113200221 in words is "thirty-one trillion, two hundred twelve billion, one hundred thirteen million, two hundred thousand, two hundred twenty-one".