12220020012121 has 4 divisors (see below), whose sum is σ = 12220701608500. Its totient is φ = 12219338415744.

The previous prime is 12220020012103. The next prime is 12220020012131. The reversal of 12220020012121 is 12121002002221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10454642756496 + 1765377255625 = 3233364^2 + 1328675^2 .

It is a cyclic number.

It is not a de Polignac number, because 12220020012121 - 2¹⁹ = 12220019487833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12220020012095 and 12220020012104.

It is not an unprimeable number, because it can be changed into a prime (12220020012131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340771296 + ... + 340807153.

It is an arithmetic number, because the mean of its divisors is an integer number (3055175402125).

Almost surely, 2^{12220020012121} is an apocalyptic number.

It is an amenable number.

12220020012121 is a deficient number, since it is larger than the sum of its proper divisors (681596379).

12220020012121 is an equidigital number, since it uses as much as digits as its factorization.

12220020012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681596378.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12220020012121 its reverse (12121002002221), we get a palindrome (24341022014342).

The spelling of 12220020012121 in words is "twelve trillion, two hundred twenty billion, twenty million, twelve thousand, one hundred twenty-one".