21130034 has 32 divisors (see below), whose sum is σ = 34378752. Its totient is φ = 9720000.

The previous prime is 21130027. The next prime is 21130037. The reversal of 21130034 is 43003112.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21130037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139859 + ... + 140009.

It is an arithmetic number, because the mean of its divisors is an integer number (1074336).

Almost surely, 2^21130034 is an apocalyptic number.

21130034 is a deficient number, since it is larger than the sum of its proper divisors (13248718).

21130034 is a wasteful number, since it uses less digits than its factorization.

21130034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21130034 is about 4596.7416720977. The cubic root of 21130034 is about 276.4606970090.

Adding to 21130034 its reverse (43003112), we get a palindrome (64133146).

The spelling of 21130034 in words is "twenty-one million, one hundred thirty thousand, thirty-four".