20021041213 has 4 divisors (see below), whose sum is σ = 20022164188. Its totient is φ = 20019918240.

The previous prime is 20021041207. The next prime is 20021041241. The reversal of 20021041213 is 31214012002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5706593764 + 14314447449 = 75542^2 + 119643^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021041213 - 2⁵ = 20021041181 is a prime.

It is a super-2 number, since 2×20021041213² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021041283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534306 + ... + 570547.

It is an arithmetic number, because the mean of its divisors is an integer number (5005541047).

Almost surely, 2^20021041213 is an apocalyptic number.

It is an amenable number.

20021041213 is a deficient number, since it is larger than the sum of its proper divisors (1122975).

20021041213 is a wasteful number, since it uses less digits than its factorization.

20021041213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122974.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20021041213 its reverse (31214012002), we get a palindrome (51235053215).

The spelling of 20021041213 in words is "twenty billion, twenty-one million, forty-one thousand, two hundred thirteen".