31212121020002 has 32 divisors (see below), whose sum is σ = 51699636480240. Its totient is φ = 14044043704320.

The previous prime is 31212121019929. The next prime is 31212121020107. The reversal of 31212121020002 is 20002012121213.

It can be written as a sum of positive squares in 8 ways, for example, as 2797794820921 + 28414326199081 = 1672661^2 + 5330509^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86899427 + ... + 87257862.

Almost surely, 2^{31212121020002} is an apocalyptic number.

31212121020002 is a deficient number, since it is larger than the sum of its proper divisors (20487515460238).

31212121020002 is a wasteful number, since it uses less digits than its factorization.

31212121020002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174157478.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 31212121020002 its reverse (20002012121213), we get a palindrome (51214133141215).

The spelling of 31212121020002 in words is "thirty-one trillion, two hundred twelve billion, one hundred twenty-one million, twenty thousand, two".