20120001111221 has 32 divisors (see below), whose sum is σ = 22178468218368. Its totient is φ = 18101086251840.

The previous prime is 20120001111209. The next prime is 20120001111239. The reversal of 20120001111221 is 12211110002102.

It is a cyclic number.

It is not a de Polignac number, because 20120001111221 - 2²² = 20119996916917 is a prime.

It is a super-2 number, since 2×20120001111221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20120001111196 and 20120001111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120001411221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 264688406 + ... + 264764408.

It is an arithmetic number, because the mean of its divisors is an integer number (693077131824).

Almost surely, 2^{20120001111221} is an apocalyptic number.

It is an amenable number.

20120001111221 is a deficient number, since it is larger than the sum of its proper divisors (2058467107147).

20120001111221 is a wasteful number, since it uses less digits than its factorization.

20120001111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76881.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20120001111221 its reverse (12211110002102), we get a palindrome (32331111113323).

The spelling of 20120001111221 in words is "twenty trillion, one hundred twenty billion, one million, one hundred eleven thousand, two hundred twenty-one".