1211253320 has 16 divisors (see below), whose sum is σ = 2725320060. Its totient is φ = 484501312.

The previous prime is 1211253317. The next prime is 1211253371. The reversal of 1211253320 is 233521121.

It can be written as a sum of positive squares in 2 ways, for example, as 1172788516 + 38464804 = 34246^2 + 6202^2 .

It is a super-2 number, since 2×1211253320² = 2934269210422044800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1211253292 and 1211253301.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15140627 + ... + 15140706.

Almost surely, 2^1211253320 is an apocalyptic number.

1211253320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211253320 is an abundant number, since it is smaller than the sum of its proper divisors (1514066740).

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

1211253320 is a wasteful number, since it uses less digits than its factorization.

1211253320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30281344 (or 30281340 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1211253320 is about 34803.0648075712. The cubic root of 1211253320 is about 1065.9700273292.

Adding to 1211253320 its reverse (233521121), we get a palindrome (1444774441).

The spelling of 1211253320 in words is "one billion, two hundred eleven million, two hundred fifty-three thousand, three hundred twenty".