121542 has 16 divisors (see below), whose sum is σ = 248832. Its totient is φ = 39560.

The previous prime is 121531. The next prime is 121547. The reversal of 121542 is 245121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121547) 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, 67 + ... + 497.

It is an arithmetic number, because the mean of its divisors is an integer number (15552).

2¹²¹⁵⁴² is an apocalyptic number.

121542 is an abundant number, since it is smaller than the sum of its proper divisors (127290).

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

121542 is a wasteful number, since it uses less digits than its factorization.

121542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483.

The product of its digits is 80, while the sum is 15.

The square root of 121542 is about 348.6287423607. The cubic root of 121542 is about 49.5346151107.

Adding to 121542 its reverse (245121), we get a palindrome (366663).

The spelling of 121542 in words is "one hundred twenty-one thousand, five hundred forty-two".