12121542 has 16 divisors (see below), whose sum is σ = 26936880. Its totient is φ = 4040496.

The previous prime is 12121541. The next prime is 12121547. The reversal of 12121542 is 24512121.

12121542 is a `hidden beast` number, since 1 + 2 + 121 + 542 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121541) 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, 112183 + ... + 112290.

It is an arithmetic number, because the mean of its divisors is an integer number (1683555).

Almost surely, 2^12121542 is an apocalyptic number.

12121542 is an abundant number, since it is smaller than the sum of its proper divisors (14815338).

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

12121542 is a wasteful number, since it uses less digits than its factorization.

12121542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224484 (or 224478 counting only the distinct ones).

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

The square root of 12121542 is about 3481.6004940257. The cubic root of 12121542 is about 229.7132027047.

Adding to 12121542 its reverse (24512121), we get a palindrome (36633663).

The spelling of 12121542 in words is "twelve million, one hundred twenty-one thousand, five hundred forty-two".