1310221221 has 8 divisors (see below), whose sum is σ = 1757679840. Its totient is φ = 868121712.

The previous prime is 1310221217. The next prime is 1310221261. The reversal of 1310221221 is 1221220131.

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

It is not a de Polignac number, because 1310221221 - 2² = 1310221217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1310221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1310221261) 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, 1339206 + ... + 1340183.

It is an arithmetic number, because the mean of its divisors is an integer number (219709980).

Almost surely, 2^1310221221 is an apocalyptic number.

It is an amenable number.

1310221221 is a deficient number, since it is larger than the sum of its proper divisors (447458619).

1310221221 is a wasteful number, since it uses less digits than its factorization.

1310221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679555.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1310221221 is about 36196.9780644738. The cubic root of 1310221221 is about 1094.2457698863.

Adding to 1310221221 its reverse (1221220131), we get a palindrome (2531441352).

The spelling of 1310221221 in words is "one billion, three hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".