1211126140 has 48 divisors (see below), whose sum is σ = 2966040000. Its totient is φ = 415240896.

The previous prime is 1211126131. The next prime is 1211126149. The reversal of 1211126140 is 416211121.

It is an interprime number because it is at equal distance from previous prime (1211126131) and next prime (1211126149).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211126149) 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, 81415 + ... + 95134.

It is an arithmetic number, because the mean of its divisors is an integer number (61792500).

Almost surely, 2^1211126140 is an apocalyptic number.

1211126140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211126140 is an abundant number, since it is smaller than the sum of its proper divisors (1754913860).

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

1211126140 is a wasteful number, since it uses less digits than its factorization.

1211126140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176579 (or 176563 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 1211126140 is about 34801.2376216709. The cubic root of 1211126140 is about 1065.9327175413.

Adding to 1211126140 its reverse (416211121), we get a palindrome (1627337261).

The spelling of 1211126140 in words is "one billion, two hundred eleven million, one hundred twenty-six thousand, one hundred forty".