21320130 has 32 divisors (see below), whose sum is σ = 55105344. Its totient is φ = 5247936.

The previous prime is 21320107. The next prime is 21320183. The reversal of 21320130 is 3102312.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26944 + ... + 27723.

It is an arithmetic number, because the mean of its divisors is an integer number (1722042).

Almost surely, 2^21320130 is an apocalyptic number.

21320130 is an abundant number, since it is smaller than the sum of its proper divisors (33785214).

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

21320130 is a wasteful number, since it uses less digits than its factorization.

21320130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54690.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 21320130 is about 4617.3726295373. The cubic root of 21320130 is about 277.2872811821.

Adding to 21320130 its reverse (3102312), we get a palindrome (24422442).

The spelling of 21320130 in words is "twenty-one million, three hundred twenty thousand, one hundred thirty".