20011212321213 has 32 divisors (see below), whose sum is σ = 27793668524800. Its totient is φ = 12795268778496.

The previous prime is 20011212321211. The next prime is 20011212321227. The reversal of 20011212321213 is 31212321211002.

It is not a de Polignac number, because 20011212321213 - 2¹ = 20011212321211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20011212321213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011212321211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13806048 + ... + 15186486.

It is an arithmetic number, because the mean of its divisors is an integer number (868552141400).

Almost surely, 2^{20011212321213} is an apocalyptic number.

It is an amenable number.

20011212321213 is a deficient number, since it is larger than the sum of its proper divisors (7782456203587).

20011212321213 is a wasteful number, since it uses less digits than its factorization.

20011212321213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1382341.

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

Adding to 20011212321213 its reverse (31212321211002), we get a palindrome (51223533532215).

The spelling of 20011212321213 in words is "twenty trillion, eleven billion, two hundred twelve million, three hundred twenty-one thousand, two hundred thirteen".