21860142 has 32 divisors (see below), whose sum is σ = 45874080. Its totient is φ = 6935040.

The previous prime is 21860117. The next prime is 21860183. The reversal of 21860142 is 24106812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11842 + ... + 13562.

It is an arithmetic number, because the mean of its divisors is an integer number (1433565).

Almost surely, 2^21860142 is an apocalyptic number.

21860142 is an abundant number, since it is smaller than the sum of its proper divisors (24013938).

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

21860142 is a wasteful number, since it uses less digits than its factorization.

21860142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 21860142 is about 4675.4830766457. The cubic root of 21860142 is about 279.6089012539.

Adding to 21860142 its reverse (24106812), we get a palindrome (45966954).

The spelling of 21860142 in words is "twenty-one million, eight hundred sixty thousand, one hundred forty-two".