21283130 has 32 divisors (see below), whose sum is σ = 42052608. Its totient is φ = 7691200.

The previous prime is 21283127. The next prime is 21283139. The reversal of 21283130 is 3138212.

It is not an unprimeable number, because it can be changed into a prime (21283139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20504 + ... + 21516.

It is an arithmetic number, because the mean of its divisors is an integer number (1314144).

Almost surely, 2^21283130 is an apocalyptic number.

21283130 is a deficient number, since it is larger than the sum of its proper divisors (20769478).

21283130 is a wasteful number, since it uses less digits than its factorization.

21283130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 21283130 is about 4613.3642821698. The cubic root of 21283130 is about 277.1267823147.

The spelling of 21283130 in words is "twenty-one million, two hundred eighty-three thousand, one hundred thirty".