1221120006 has 32 divisors (see below), whose sum is σ = 2576396160. Its totient is φ = 384774336.

The previous prime is 1221120001. The next prime is 1221120007. The reversal of 1221120006 is 6000211221.

It is a super-3 number, since 3×1221120006³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221120001) 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, 41770 + ... + 64706.

It is an arithmetic number, because the mean of its divisors is an integer number (80512380).

Almost surely, 2^1221120006 is an apocalyptic number.

1221120006 is an abundant number, since it is smaller than the sum of its proper divisors (1355276154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221120006 is a wasteful number, since it uses less digits than its factorization.

1221120006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23428.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1221120006 is about 34944.5275543968. The cubic root of 1221120006 is about 1068.8566136658.

Adding to 1221120006 its reverse (6000211221), we get a palindrome (7221331227).

The spelling of 1221120006 in words is "one billion, two hundred twenty-one million, one hundred twenty thousand, six".