20012000111221 has 16 divisors (see below), whose sum is σ = 20208854550528. Its totient is φ = 19815498976000.

The previous prime is 20012000111219. The next prime is 20012000111267. The reversal of 20012000111221 is 12211100021002.

It is a cyclic number.

It is not a de Polignac number, because 20012000111221 - 2¹ = 20012000111219 is a prime.

It is a super-2 number, since 2×20012000111221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012000111021) 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, 888976356 + ... + 888998866.

It is an arithmetic number, because the mean of its divisors is an integer number (1263053409408).

Almost surely, 2^{20012000111221} is an apocalyptic number.

It is an amenable number.

20012000111221 is a deficient number, since it is larger than the sum of its proper divisors (196854439307).

20012000111221 is a wasteful number, since it uses less digits than its factorization.

20012000111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29972.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20012000111221 its reverse (12211100021002), we get a palindrome (32223100132223).

The spelling of 20012000111221 in words is "twenty trillion, twelve billion, one hundred eleven thousand, two hundred twenty-one".