20112001221 has 16 divisors (see below), whose sum is σ = 28885417344. Its totient is φ = 12373767744.

The previous prime is 20112001171. The next prime is 20112001229. The reversal of 20112001221 is 12210021102.

It is not a de Polignac number, because 20112001221 - 2²¹ = 20109904069 is a prime.

It is a super-2 number, since 2×20112001221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20112001197 and 20112001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112001229) 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, 119080 + ... + 233246.

It is an arithmetic number, because the mean of its divisors is an integer number (1805338584).

Almost surely, 2^20112001221 is an apocalyptic number.

It is an amenable number.

20112001221 is a deficient number, since it is larger than the sum of its proper divisors (8773416123).

20112001221 is a wasteful number, since it uses less digits than its factorization.

20112001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118700.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20112001221 its reverse (12210021102), we get a palindrome (32322022323).

The spelling of 20112001221 in words is "twenty billion, one hundred twelve million, one thousand, two hundred twenty-one".