20113231221021 has 16 divisors (see below), whose sum is σ = 27030529456128. Its totient is φ = 13302438817200.

The previous prime is 20113231220977. The next prime is 20113231221077. The reversal of 20113231221021 is 12012213231102.

It is not a de Polignac number, because 20113231221021 - 2¹³ = 20113231212829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20113231221521) 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, 6438285 + ... + 9037586.

It is an arithmetic number, because the mean of its divisors is an integer number (1689408091008).

Almost surely, 2^{20113231221021} is an apocalyptic number.

It is an amenable number.

20113231221021 is a deficient number, since it is larger than the sum of its proper divisors (6917298235107).

20113231221021 is a wasteful number, since it uses less digits than its factorization.

20113231221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15479312.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 20113231221021 its reverse (12012213231102), we get a palindrome (32125444452123).

The spelling of 20113231221021 in words is "twenty trillion, one hundred thirteen billion, two hundred thirty-one million, two hundred twenty-one thousand, twenty-one".