21542106 has 16 divisors (see below), whose sum is σ = 43480800. Its totient is φ = 7114608.

The previous prime is 21542093. The next prime is 21542119. The reversal of 21542106 is 60124512.

It is an interprime number because it is at equal distance from previous prime (21542093) and next prime (21542119).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15816 + ... + 17123.

It is an arithmetic number, because the mean of its divisors is an integer number (2717550).

Almost surely, 2^21542106 is an apocalyptic number.

21542106 is an abundant number, since it is smaller than the sum of its proper divisors (21938694).

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

21542106 is a wasteful number, since it uses less digits than its factorization.

21542106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33053.

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

The square root of 21542106 is about 4641.3474336662. The cubic root of 21542106 is about 278.2462924394.

Adding to 21542106 its reverse (60124512), we get a palindrome (81666618).

The spelling of 21542106 in words is "twenty-one million, five hundred forty-two thousand, one hundred six".