1212220123021 has 4 divisors (see below), whose sum is σ = 1212997687200. Its totient is φ = 1211442558844.

The previous prime is 1212220122959. The next prime is 1212220123027. The reversal of 1212220123021 is 1203210222121.

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 1212220123021 - 2¹³ = 1212220114829 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 1212220123021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212220123027) 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 3 ways as a sum of consecutive naturals, for example, 388779751 + ... + 388782868.

It is an arithmetic number, because the mean of its divisors is an integer number (303249421800).

Almost surely, 2^{1212220123021} is an apocalyptic number.

It is an amenable number.

1212220123021 is a deficient number, since it is larger than the sum of its proper divisors (777564179).

1212220123021 is an equidigital number, since it uses as much as digits as its factorization.

1212220123021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777564178.

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

Adding to 1212220123021 its reverse (1203210222121), we get a palindrome (2415430345142).

The spelling of 1212220123021 in words is "one trillion, two hundred twelve billion, two hundred twenty million, one hundred twenty-three thousand, twenty-one".