20011212213021 has 12 divisors (see below), whose sum is σ = 29901811353180. Its totient is φ = 12880780274880.

The previous prime is 20011212213007. The next prime is 20011212213053. The reversal of 20011212213021 is 12031221211002.

20011212213021 is a `hidden beast` number, since 20 + 0 + 1 + 121 + 221 + 302 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6688792512900 + 13322419700121 = 2586270^2 + 3649989^2 .

It is not a de Polignac number, because 20011212213021 - 2¹⁰ = 20011212211997 is a prime.

It is a super-2 number, since 2×20011212213021² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20011212212985 and 20011212213003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011212293021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38335655320 + ... + 38335655841.

It is an arithmetic number, because the mean of its divisors is an integer number (2491817612765).

Almost surely, 2^{20011212213021} is an apocalyptic number.

It is an amenable number.

20011212213021 is a deficient number, since it is larger than the sum of its proper divisors (9890599140159).

20011212213021 is a wasteful number, since it uses less digits than its factorization.

20011212213021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76671311196 (or 76671311193 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 20011212213021 its reverse (12031221211002), we get a palindrome (32042433424023).

The spelling of 20011212213021 in words is "twenty trillion, eleven billion, two hundred twelve million, two hundred thirteen thousand, twenty-one".