21142110 has 32 divisors (see below), whose sum is σ = 55354752. Its totient is φ = 5125280.

The previous prime is 21142109. The next prime is 21142123. The reversal of 21142110 is 1124112.

It is a happy number.

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, 31704 + ... + 32363.

It is an arithmetic number, because the mean of its divisors is an integer number (1729836).

Almost surely, 2^21142110 is an apocalyptic number.

21142110 is an abundant number, since it is smaller than the sum of its proper divisors (34212642).

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

21142110 is a wasteful number, since it uses less digits than its factorization.

21142110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64088.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 21142110 is about 4598.0550235942. The cubic root of 21142110 is about 276.5133535511.

Adding to 21142110 its reverse (1124112), we get a palindrome (22266222).

It can be divided in two parts, 2114 and 2110, that added together give a palindrome (4224).

The spelling of 21142110 in words is "twenty-one million, one hundred forty-two thousand, one hundred ten".