12122011621 has 4 divisors (see below), whose sum is σ = 12403918912. Its totient is φ = 11840104332.

The previous prime is 12122011613. The next prime is 12122011631. The reversal of 12122011621 is 12611022121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12122011621 - 2³ = 12122011613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122011631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140953581 + ... + 140953666.

It is an arithmetic number, because the mean of its divisors is an integer number (3100979728).

Almost surely, 2^12122011621 is an apocalyptic number.

It is an amenable number.

12122011621 is a deficient number, since it is larger than the sum of its proper divisors (281907291).

12122011621 is an equidigital number, since it uses as much as digits as its factorization.

12122011621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281907290.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 12122011621 its reverse (12611022121), we get a palindrome (24733033742).

The spelling of 12122011621 in words is "twelve billion, one hundred twenty-two million, eleven thousand, six hundred twenty-one".