12011421021 has 8 divisors (see below), whose sum is σ = 16056399840. Its totient is φ = 7987028112.

The previous prime is 12011420989. The next prime is 12011421053. The reversal of 12011421021 is 12012411021.

It is an interprime number because it is at equal distance from previous prime (12011420989) and next prime (12011421053).

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

It is not a de Polignac number, because 12011421021 - 2⁵ = 12011420989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011421091) 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, 5145115 + ... + 5147448.

It is an arithmetic number, because the mean of its divisors is an integer number (2007049980).

Almost surely, 2^12011421021 is an apocalyptic number.

It is an amenable number.

12011421021 is a deficient number, since it is larger than the sum of its proper divisors (4044978819).

12011421021 is a wasteful number, since it uses less digits than its factorization.

12011421021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10292955.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12011421021 its reverse (12012411021), we get a palindrome (24023832042).

The spelling of 12011421021 in words is "twelve billion, eleven million, four hundred twenty-one thousand, twenty-one".