12011012221 has 8 divisors (see below), whose sum is σ = 12944046080. Its totient is φ = 11079279792.

The previous prime is 12011012171. The next prime is 12011012231. The reversal of 12011012221 is 12221011021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12011012221 - 2¹³ = 12011004029 is a prime.

It is a super-2 number, since 2×12011012221² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011012231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306141 + ... + 343138.

It is an arithmetic number, because the mean of its divisors is an integer number (1618005760).

Almost surely, 2^12011012221 is an apocalyptic number.

It is an amenable number.

12011012221 is a deficient number, since it is larger than the sum of its proper divisors (933033859).

12011012221 is a wasteful number, since it uses less digits than its factorization.

12011012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650715.

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

Adding to 12011012221 its reverse (12221011021), we get a palindrome (24232023242).

The spelling of 12011012221 in words is "twelve billion, eleven million, twelve thousand, two hundred twenty-one".