1240121205 has 16 divisors (see below), whose sum is σ = 2204660160. Its totient is φ = 661397904.

The previous prime is 1240121167. The next prime is 1240121213. The reversal of 1240121205 is 5021210421.

It is not a de Polignac number, because 1240121205 - 2⁸ = 1240120949 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4592907 + ... + 4593176.

It is an arithmetic number, because the mean of its divisors is an integer number (137791260).

Almost surely, 2^1240121205 is an apocalyptic number.

1240121205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1240121205 is a deficient number, since it is larger than the sum of its proper divisors (964538955).

1240121205 is an equidigital number, since it uses as much as digits as its factorization.

1240121205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9186097 (or 9186091 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1240121205 is about 35215.3546766180. The cubic root of 1240121205 is about 1074.3720738874.

Adding to 1240121205 its reverse (5021210421), we get a palindrome (6261331626).

The spelling of 1240121205 in words is "one billion, two hundred forty million, one hundred twenty-one thousand, two hundred five".