1313211220 has 96 divisors (see below), whose sum is σ = 3062304000. Its totient is φ = 470790144.

The previous prime is 1313211217. The next prime is 1313211247. The reversal of 1313211220 is 221123131.

It is a junction number, because it is equal to n+sod(n) for n = 1313211194 and 1313211203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 847006 + ... + 848554.

It is an arithmetic number, because the mean of its divisors is an integer number (31899000).

Almost surely, 2^1313211220 is an apocalyptic number.

1313211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1313211220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1531152000).

1313211220 is an abundant number, since it is smaller than the sum of its proper divisors (1749092780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1313211220 is a wasteful number, since it uses less digits than its factorization.

1313211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1697 (or 1695 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1313211220 is about 36238.2563046292. The cubic root of 1313211220 is about 1095.0775144421.

Adding to 1313211220 its reverse (221123131), we get a palindrome (1534334351).

The spelling of 1313211220 in words is "one billion, three hundred thirteen million, two hundred eleven thousand, two hundred twenty".