21042110 has 16 divisors (see below), whose sum is σ = 39182400. Its totient is φ = 8126496.

The previous prime is 21042103. The next prime is 21042127. The reversal of 21042110 is 1124012.

It is a junction number, because it is equal to n+sod(n) for n = 21042091 and 21042100.

It is a congruent number.

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, 35990 + ... + 36569.

It is an arithmetic number, because the mean of its divisors is an integer number (2448900).

Almost surely, 2^21042110 is an apocalyptic number.

21042110 is a deficient number, since it is larger than the sum of its proper divisors (18140290).

21042110 is a wasteful number, since it uses less digits than its factorization.

21042110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72595.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 21042110 is about 4587.1679716357. The cubic root of 21042110 is about 276.0767045086.

Adding to 21042110 its reverse (1124012), we get a palindrome (22166122).

The spelling of 21042110 in words is "twenty-one million, forty-two thousand, one hundred ten".