20013120221 has 8 divisors (see below), whose sum is σ = 20112105888. Its totient is φ = 19914174000.

The previous prime is 20013120209. The next prime is 20013120233. The reversal of 20013120221 is 12202131002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20013120209) and next prime (20013120233).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20013120221 - 2²⁶ = 19946011357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20013120196 and 20013120205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013120251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1932026 + ... + 1942356.

It is an arithmetic number, because the mean of its divisors is an integer number (2514013236).

Almost surely, 2^20013120221 is an apocalyptic number.

It is an amenable number.

20013120221 is a deficient number, since it is larger than the sum of its proper divisors (98985667).

20013120221 is a wasteful number, since it uses less digits than its factorization.

20013120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19723.

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

Adding to 20013120221 its reverse (12202131002), we get a palindrome (32215251223).

The spelling of 20013120221 in words is "twenty billion, thirteen million, one hundred twenty thousand, two hundred twenty-one".