1321212121223 has 8 divisors (see below), whose sum is σ = 1331669452800. Its totient is φ = 1310755635000.

The previous prime is 1321212121199. The next prime is 1321212121267. The reversal of 1321212121223 is 3221212121231.

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-1321212121223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321212111223) 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, 3135728 + ... + 3532026.

It is an arithmetic number, because the mean of its divisors is an integer number (166458681600).

Almost surely, 2^{1321212121223} is an apocalyptic number.

1321212121223 is a deficient number, since it is larger than the sum of its proper divisors (10457331577).

1321212121223 is a wasteful number, since it uses less digits than its factorization.

1321212121223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422677.

The product of its digits is 576, while the sum is 23.

Adding to 1321212121223 its reverse (3221212121231), we get a palindrome (4542424242454).

The spelling of 1321212121223 in words is "one trillion, three hundred twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twenty-three".