20113021111221 has 64 divisors (see below), whose sum is σ = 30580267737600. Its totient is φ = 13061107353600.

The previous prime is 20113021111217. The next prime is 20113021111237. The reversal of 20113021111221 is 12211112031102.

It is a happy number.

20113021111221 is a `hidden beast` number, since 20 + 11 + 302 + 1 + 111 + 221 = 666.

It is not a de Polignac number, because 20113021111221 - 2² = 20113021111217 is a prime.

It is a super-2 number, since 2×20113021111221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20113021111194 and 20113021111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20113021111621) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 73852261 + ... + 74124101.

It is an arithmetic number, because the mean of its divisors is an integer number (477816683400).

Almost surely, 2^{20113021111221} is an apocalyptic number.

It is an amenable number.

20113021111221 is a deficient number, since it is larger than the sum of its proper divisors (10467246626379).

20113021111221 is a wasteful number, since it uses less digits than its factorization.

20113021111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272347 (or 272341 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 20113021111221 its reverse (12211112031102), we get a palindrome (32324133142323).

The spelling of 20113021111221 in words is "twenty trillion, one hundred thirteen billion, twenty-one million, one hundred eleven thousand, two hundred twenty-one".