21130302 has 16 divisors (see below), whose sum is σ = 42496272. Its totient is φ = 7004160.

The previous prime is 21130301. The next prime is 21130321. The reversal of 21130302 is 20303112.

It is a happy number.

It is a super-2 number, since 2×21130302² = 892979325222408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130301) 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, 8643 + ... + 10814.

It is an arithmetic number, because the mean of its divisors is an integer number (2656017).

Almost surely, 2^21130302 is an apocalyptic number.

21130302 is an abundant number, since it is smaller than the sum of its proper divisors (21365970).

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

21130302 is a wasteful number, since it uses less digits than its factorization.

21130302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19643.

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

The square root of 21130302 is about 4596.7708230887. The cubic root of 21130302 is about 276.4618658216.

Adding to 21130302 its reverse (20303112), we get a palindrome (41433414).

The spelling of 21130302 in words is "twenty-one million, one hundred thirty thousand, three hundred two".