21120310 has 16 divisors (see below), whose sum is σ = 38901456. Its totient is φ = 8251488.

The previous prime is 21120283. The next prime is 21120311. The reversal of 21120310 is 1302112.

It is a super-2 number, since 2×21120310² = 892134988992200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24129 + ... + 24988.

It is an arithmetic number, because the mean of its divisors is an integer number (2431341).

Almost surely, 2^21120310 is an apocalyptic number.

21120310 is a deficient number, since it is larger than the sum of its proper divisors (17781146).

21120310 is a wasteful number, since it uses less digits than its factorization.

21120310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49167.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 21120310 is about 4595.6838446525. The cubic root of 21120310 is about 276.4182816125.

Adding to 21120310 its reverse (1302112), we get a palindrome (22422422).

The spelling of 21120310 in words is "twenty-one million, one hundred twenty thousand, three hundred ten".