1211211140 has 24 divisors (see below), whose sum is σ = 2544386712. Its totient is φ = 484323840.

The previous prime is 1211211077. The next prime is 1211211203. The reversal of 1211211140 is 411121121.

It is an interprime number because it is at equal distance from previous prime (1211211077) and next prime (1211211203).

It can be written as a sum of positive squares in 4 ways, for example, as 110166016 + 1101045124 = 10496^2 + 33182^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65750 + ... + 82130.

It is an arithmetic number, because the mean of its divisors is an integer number (106016113).

Almost surely, 2^1211211140 is an apocalyptic number.

1211211140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211211140 is an abundant number, since it is smaller than the sum of its proper divisors (1333175572).

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

1211211140 is a wasteful number, since it uses less digits than its factorization.

1211211140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20087 (or 20085 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 1211211140 is about 34802.4588211810. The cubic root of 1211211140 is about 1065.9576536066.

Adding to 1211211140 its reverse (411121121), we get a palindrome (1622332261).

The spelling of 1211211140 in words is "one billion, two hundred eleven million, two hundred eleven thousand, one hundred forty".