20041221213 has 12 divisors (see below), whose sum is σ = 31175233180. Its totient is φ = 12333059136.

The previous prime is 20041221209. The next prime is 20041221227. The reversal of 20041221213 is 31212214002.

It is a happy number.

20041221213 is a `hidden beast` number, since 20 + 0 + 412 + 21 + 213 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1946397924 + 18094823289 = 44118^2 + 134517^2 .

It is not a de Polignac number, because 20041221213 - 2² = 20041221209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20041221283) 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, 85646128 + ... + 85646361.

Almost surely, 2^20041221213 is an apocalyptic number.

It is an amenable number.

20041221213 is a deficient number, since it is larger than the sum of its proper divisors (11134011967).

20041221213 is a wasteful number, since it uses less digits than its factorization.

20041221213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171292508 (or 171292505 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 20041221213 its reverse (31212214002), we get a palindrome (51253435215).

The spelling of 20041221213 in words is "twenty billion, forty-one million, two hundred twenty-one thousand, two hundred thirteen".