20012221013 has 4 divisors (see below), whose sum is σ = 20189320428. Its totient is φ = 19835121600.

The previous prime is 20012220983. The next prime is 20012221063. The reversal of 20012221013 is 31012221002.

It is a happy number.

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 1127414929 + 18884806084 = 33577^2 + 137422^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012221013 - 2¹⁰ = 20012219989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012221063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88549538 + ... + 88549763.

It is an arithmetic number, because the mean of its divisors is an integer number (5047330107).

Almost surely, 2^20012221013 is an apocalyptic number.

It is an amenable number.

20012221013 is a deficient number, since it is larger than the sum of its proper divisors (177099415).

20012221013 is a wasteful number, since it uses less digits than its factorization.

20012221013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177099414.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20012221013 its reverse (31012221002), we get a palindrome (51024442015).

The spelling of 20012221013 in words is "twenty billion, twelve million, two hundred twenty-one thousand, thirteen".