31212103200221 has 4 divisors (see below), whose sum is σ = 32569151165472. Its totient is φ = 29855055234972.

The previous prime is 31212103200211. The next prime is 31212103200247. The reversal of 31212103200221 is 12200230121213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31212103200221 - 2¹⁴ = 31212103183837 is a prime.

It is a super-2 number, since 2×31212103200221² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31212103200193 and 31212103200202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212103200211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 678523982591 + ... + 678523982636.

It is an arithmetic number, because the mean of its divisors is an integer number (8142287791368).

Almost surely, 2^{31212103200221} is an apocalyptic number.

It is an amenable number.

31212103200221 is a deficient number, since it is larger than the sum of its proper divisors (1357047965251).

31212103200221 is a wasteful number, since it uses less digits than its factorization.

31212103200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357047965250.

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

Adding to 31212103200221 its reverse (12200230121213), we get a palindrome (43412333321434).

The spelling of 31212103200221 in words is "thirty-one trillion, two hundred twelve billion, one hundred three million, two hundred thousand, two hundred twenty-one".