12012221981 has 8 divisors (see below), whose sum is σ = 12815915904. Its totient is φ = 11219316160.

The previous prime is 12012221929. The next prime is 12012221987. The reversal of 12012221981 is 18912221021.

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 12012221981 - 2⁶ = 12012221917 is a prime.

It is a super-2 number, since 2×12012221981² (a number of 21 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 (12012221987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2694725 + ... + 2699178.

It is an arithmetic number, because the mean of its divisors is an integer number (1601989488).

Almost surely, 2^12012221981 is an apocalyptic number.

It is an amenable number.

12012221981 is a deficient number, since it is larger than the sum of its proper divisors (803693923).

12012221981 is a wasteful number, since it uses less digits than its factorization.

12012221981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5394051.

The product of its (nonzero) digits is 1152, while the sum is 29.

The spelling of 12012221981 in words is "twelve billion, twelve million, two hundred twenty-one thousand, nine hundred eighty-one".