1213021331221 has 16 divisors (see below), whose sum is σ = 1466606848000. Its totient is φ = 980059983408.

The previous prime is 1213021331219. The next prime is 1213021331233. The reversal of 1213021331221 is 1221331203121.

It is a cyclic number.

It is not a de Polignac number, because 1213021331221 - 2¹ = 1213021331219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213021331192 and 1213021331201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213021331261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22889265 + ... + 22942198.

It is an arithmetic number, because the mean of its divisors is an integer number (91662928000).

Almost surely, 2^{1213021331221} is an apocalyptic number.

It is an amenable number.

1213021331221 is a deficient number, since it is larger than the sum of its proper divisors (253585516779).

1213021331221 is a wasteful number, since it uses less digits than its factorization.

1213021331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45831688.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1213021331221 its reverse (1221331203121), we get a palindrome (2434352534342).

The spelling of 1213021331221 in words is "one trillion, two hundred thirteen billion, twenty-one million, three hundred thirty-one thousand, two hundred twenty-one".