1213120212221 has 8 divisors (see below), whose sum is σ = 1216563024960. Its totient is φ = 1209682038528.

The previous prime is 1213120212091. The next prime is 1213120212233. The reversal of 1213120212221 is 1222120213121.

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-1213120212221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213120212193 and 1213120212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213120215221) 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, 635681 + ... + 1682358.

It is an arithmetic number, because the mean of its divisors is an integer number (152070378120).

Almost surely, 2^{1213120212221} is an apocalyptic number.

It is an amenable number.

1213120212221 is a deficient number, since it is larger than the sum of its proper divisors (3442812739).

1213120212221 is an equidigital number, since it uses as much as digits as its factorization.

1213120212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319523.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1213120212221 its reverse (1222120213121), we get a palindrome (2435240425342).

The spelling of 1213120212221 in words is "one trillion, two hundred thirteen billion, one hundred twenty million, two hundred twelve thousand, two hundred twenty-one".