123212122021 has 4 divisors (see below), whose sum is σ = 123219065344. Its totient is φ = 123205178700.

The previous prime is 123212121979. The next prime is 123212122031. The reversal of 123212122021 is 120221212321.

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 123212122021 - 2¹¹ = 123212119973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123212122021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123212122031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3444975 + ... + 3480556.

It is an arithmetic number, because the mean of its divisors is an integer number (30804766336).

Almost surely, 2^123212122021 is an apocalyptic number.

It is an amenable number.

123212122021 is a deficient number, since it is larger than the sum of its proper divisors (6943323).

123212122021 is an equidigital number, since it uses as much as digits as its factorization.

123212122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6943322.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 123212122021 its reverse (120221212321), we get a palindrome (243433334342).

The spelling of 123212122021 in words is "one hundred twenty-three billion, two hundred twelve million, one hundred twenty-two thousand, twenty-one".