1220000212121 has 8 divisors (see below), whose sum is σ = 1233025126464. Its totient is φ = 1206993841200.

The previous prime is 1220000212111. The next prime is 1220000212199. The reversal of 1220000212121 is 1212120000221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220000212121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220000212096 and 1220000212105.

It is not an unprimeable number, because it can be changed into a prime (1220000212111) 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, 4503551 + ... + 4766756.

It is an arithmetic number, because the mean of its divisors is an integer number (154128140808).

Almost surely, 2^{1220000212121} is an apocalyptic number.

It is an amenable number.

1220000212121 is a deficient number, since it is larger than the sum of its proper divisors (13024914343).

1220000212121 is a wasteful number, since it uses less digits than its factorization.

1220000212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9271711.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1220000212121 its reverse (1212120000221), we get a palindrome (2432120212342).

The spelling of 1220000212121 in words is "one trillion, two hundred twenty billion, two hundred twelve thousand, one hundred twenty-one".