121312542 has 16 divisors (see below), whose sum is σ = 261288720. Its totient is φ = 37326912.

The previous prime is 121312537. The next prime is 121312547. The reversal of 121312542 is 245213121.

It is an interprime number because it is at equal distance from previous prime (121312537) and next prime (121312547).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121312547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 777567 + ... + 777722.

It is an arithmetic number, because the mean of its divisors is an integer number (16330545).

Almost surely, 2^121312542 is an apocalyptic number.

121312542 is an abundant number, since it is smaller than the sum of its proper divisors (139976178).

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

121312542 is a wasteful number, since it uses less digits than its factorization.

121312542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555307.

The product of its digits is 480, while the sum is 21.

The square root of 121312542 is about 11014.1972925856. The cubic root of 121312542 is about 495.0342349549.

Adding to 121312542 its reverse (245213121), we get a palindrome (366525663).

The spelling of 121312542 in words is "one hundred twenty-one million, three hundred twelve thousand, five hundred forty-two".