1211240320 has 32 divisors (see below), whose sum is σ = 2895622920. Its totient is φ = 484495872.

The previous prime is 1211240299. The next prime is 1211240347. The reversal of 1211240320 is 230421121.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-3 number, since 3×1211240320³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 1211240294 and 1211240303.

It is a congruent number.

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, 945642 + ... + 946921.

Almost surely, 2^1211240320 is an apocalyptic number.

1211240320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211240320 is an abundant number, since it is smaller than the sum of its proper divisors (1684382600).

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

1211240320 is an equidigital number, since it uses as much as digits as its factorization.

1211240320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1892582 (or 1892570 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1211240320 is about 34802.8780419091. The cubic root of 1211240320 is about 1065.9662137421.

Adding to 1211240320 its reverse (230421121), we get a palindrome (1441661441).

The spelling of 1211240320 in words is "one billion, two hundred eleven million, two hundred forty thousand, three hundred twenty".