1221311140 has 48 divisors (see below), whose sum is σ = 2938061952. Its totient is φ = 417747456.

The previous prime is 1221311111. The next prime is 1221311149. The reversal of 1221311140 is 411131221.

It is a super-3 number, since 3×1221311140³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221311149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50547 + ... + 70693.

It is an arithmetic number, because the mean of its divisors is an integer number (61209624).

Almost surely, 2^1221311140 is an apocalyptic number.

1221311140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221311140 is an abundant number, since it is smaller than the sum of its proper divisors (1716750812).

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

1221311140 is a wasteful number, since it uses less digits than its factorization.

1221311140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20596 (or 20594 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1221311140 is about 34947.2622675940. The cubic root of 1221311140 is about 1068.9123778225.

Adding to 1221311140 its reverse (411131221), we get a palindrome (1632442361).

The spelling of 1221311140 in words is "one billion, two hundred twenty-one million, three hundred eleven thousand, one hundred forty".