1313021101221 has 24 divisors (see below), whose sum is σ = 1948812877440. Its totient is φ = 851413058496.

The previous prime is 1313021101199. The next prime is 1313021101253. The reversal of 1313021101221 is 1221011203131.

1313021101221 is a `hidden beast` number, since 1 + 31 + 302 + 110 + 1 + 221 = 666.

It is not a de Polignac number, because 1313021101221 - 2¹⁸ = 1313020839077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1313021101194 and 1313021101203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313021102221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7005456 + ... + 7190441.

It is an arithmetic number, because the mean of its divisors is an integer number (81200536560).

Almost surely, 2^{1313021101221} is an apocalyptic number.

It is an amenable number.

1313021101221 is a deficient number, since it is larger than the sum of its proper divisors (635791776219).

1313021101221 is a wasteful number, since it uses less digits than its factorization.

1313021101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14196185 (or 14196182 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 1313021101221 its reverse (1221011203131), we get a palindrome (2534032304352).

The spelling of 1313021101221 in words is "one trillion, three hundred thirteen billion, twenty-one million, one hundred one thousand, two hundred twenty-one".