31312211010221 has 8 divisors (see below), whose sum is σ = 31375784763960. Its totient is φ = 31248645322752.

The previous prime is 31312211010203. The next prime is 31312211010251. The reversal of 31312211010221 is 12201011221313.

It can be written as a sum of positive squares in 4 ways, for example, as 3091530975625 + 28220680034596 = 1758275^2 + 5312314^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 31312211010221 - 2¹⁴ = 31312210993837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31312211010193 and 31312211010202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312211010251) 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, 5785661 + ... + 9802973.

It is an arithmetic number, because the mean of its divisors is an integer number (3921973095495).

Almost surely, 2^{31312211010221} is an apocalyptic number.

It is an amenable number.

31312211010221 is a deficient number, since it is larger than the sum of its proper divisors (63573753739).

31312211010221 is a wasteful number, since it uses less digits than its factorization.

31312211010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4033135.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 31312211010221 its reverse (12201011221313), we get a palindrome (43513222231534).

The spelling of 31312211010221 in words is "thirty-one trillion, three hundred twelve billion, two hundred eleven million, ten thousand, two hundred twenty-one".