1313222021 has 8 divisors (see below), whose sum is σ = 1356325344. Its totient is φ = 1270689840.

The previous prime is 1313222017. The next prime is 1313222023. The reversal of 1313222021 is 1202223131.

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

It is a cyclic number.

It is not a de Polignac number, because 1313222021 - 2² = 1313222017 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 (1313222023) 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, 138110 + ... + 147311.

It is an arithmetic number, because the mean of its divisors is an integer number (169540668).

Almost surely, 2^1313222021 is an apocalyptic number.

It is an amenable number.

1313222021 is a deficient number, since it is larger than the sum of its proper divisors (43103323).

1313222021 is a wasteful number, since it uses less digits than its factorization.

1313222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285571.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1313222021 is about 36238.4053319127. The cubic root of 1313222021 is about 1095.0805167262.

Adding to 1313222021 its reverse (1202223131), we get a palindrome (2515445152).

It can be divided in two parts, 13132 and 22021, that added together give a palindrome (35153).

The spelling of 1313222021 in words is "one billion, three hundred thirteen million, two hundred twenty-two thousand, twenty-one".