31212201033221 has 16 divisors (see below), whose sum is σ = 35428292872560. Its totient is φ = 27292907066880.

The previous prime is 31212201033179. The next prime is 31212201033227. The reversal of 31212201033221 is 12233010221213.

It can be written as a sum of positive squares in 8 ways, for example, as 1394321702596 + 29817879330625 = 1180814^2 + 5460575^2 .

It is not a de Polignac number, because 31212201033221 - 2¹⁴ = 31212201016837 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 (31212201033227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 781027040 + ... + 781067001.

It is an arithmetic number, because the mean of its divisors is an integer number (2214268304535).

Almost surely, 2^{31212201033221} is an apocalyptic number.

It is an amenable number.

31212201033221 is a deficient number, since it is larger than the sum of its proper divisors (4216091839339).

31212201033221 is a wasteful number, since it uses less digits than its factorization.

31212201033221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562094136.

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

Adding to 31212201033221 its reverse (12233010221213), we get a palindrome (43445211254434).

The spelling of 31212201033221 in words is "thirty-one trillion, two hundred twelve billion, two hundred one million, thirty-three thousand, two hundred twenty-one".