20103011221 has 16 divisors (see below), whose sum is σ = 20988442368. Its totient is φ = 19240401600.

The previous prime is 20103011209. The next prime is 20103011251. The reversal of 20103011221 is 12211030102.

It is a cyclic number.

It is not a de Polignac number, because 20103011221 - 2²⁵ = 20069456789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20103011251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 475726 + ... + 516256.

It is an arithmetic number, because the mean of its divisors is an integer number (1311777648).

Almost surely, 2^20103011221 is an apocalyptic number.

It is an amenable number.

20103011221 is a deficient number, since it is larger than the sum of its proper divisors (885431147).

20103011221 is a wasteful number, since it uses less digits than its factorization.

20103011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40812.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20103011221 its reverse (12211030102), we get a palindrome (32314041323).

The spelling of 20103011221 in words is "twenty billion, one hundred three million, eleven thousand, two hundred twenty-one".