21000130 has 16 divisors (see below), whose sum is σ = 39790080. Its totient is φ = 7957872.

The previous prime is 21000121. The next prime is 21000131. The reversal of 21000130 is 3100012.

It is not an unprimeable number, because it can be changed into a prime (21000131) 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 7 ways as a sum of consecutive naturals, for example, 55074 + ... + 55453.

It is an arithmetic number, because the mean of its divisors is an integer number (2486880).

Almost surely, 2^21000130 is an apocalyptic number.

21000130 is a deficient number, since it is larger than the sum of its proper divisors (18789950).

21000130 is a wasteful number, since it uses less digits than its factorization.

21000130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110553.

The product of its (nonzero) digits is 6, while the sum is 7.

The square root of 21000130 is about 4582.5898790968. The cubic root of 21000130 is about 275.8929869388.

Adding to 21000130 its reverse (3100012), we get a palindrome (24100142).

The spelling of 21000130 in words is "twenty-one million, one hundred thirty", and thus it is an aban number.