213542 has 12 divisors (see below), whose sum is σ = 372780. Its totient is φ = 91476.

The previous prime is 213539. The next prime is 213553. The reversal of 213542 is 245312.

It is a self number, because there is not a number n which added to its sum of digits gives 213542.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 992 + ... + 1187.

It is an arithmetic number, because the mean of its divisors is an integer number (31065).

2²¹³⁵⁴² is an apocalyptic number.

213542 is a deficient number, since it is larger than the sum of its proper divisors (159238).

213542 is a wasteful number, since it uses less digits than its factorization.

213542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195 (or 2188 counting only the distinct ones).

The product of its digits is 240, while the sum is 17.

The square root of 213542 is about 462.1060484348. The cubic root of 213542 is about 59.7715386013.

Adding to 213542 its reverse (245312), we get a palindrome (458854).

The spelling of 213542 in words is "two hundred thirteen thousand, five hundred forty-two".