21050130 has 16 divisors (see below), whose sum is σ = 50520384. Its totient is φ = 5613360.

The previous prime is 21050111. The next prime is 21050137. The reversal of 21050130 is 3105012.

It is not an unprimeable number, because it can be changed into a prime (21050137) 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, 350806 + ... + 350865.

It is an arithmetic number, because the mean of its divisors is an integer number (3157524).

Almost surely, 2^21050130 is an apocalyptic number.

21050130 is an abundant number, since it is smaller than the sum of its proper divisors (29470254).

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

21050130 is a wasteful number, since it uses less digits than its factorization.

21050130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701681.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 21050130 is about 4588.0420660670. The cubic root of 21050130 is about 276.1117747231. Note that the first 3 decimals are identical.

Adding to 21050130 its reverse (3105012), we get a palindrome (24155142).

The spelling of 21050130 in words is "twenty-one million, fifty thousand, one hundred thirty".