21313030 has 32 divisors (see below), whose sum is σ = 39644640. Its totient is φ = 8244480.

The previous prime is 21313021. The next prime is 21313037. The reversal of 21313030 is 3031312.

It is a self number, because there is not a number n which added to its sum of digits gives 21313030.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313037) 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, 92956 + ... + 93184.

It is an arithmetic number, because the mean of its divisors is an integer number (1238895).

Almost surely, 2^21313030 is an apocalyptic number.

21313030 is a deficient number, since it is larger than the sum of its proper divisors (18331610).

21313030 is a wasteful number, since it uses less digits than its factorization.

21313030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 21313030 is about 4616.6037300163. The cubic root of 21313030 is about 277.2564971566.

Adding to 21313030 its reverse (3031312), we get a palindrome (24344342).

The spelling of 21313030 in words is "twenty-one million, three hundred thirteen thousand, thirty".