21713030 has 16 divisors (see below), whose sum is σ = 39200544. Its totient is φ = 8659200.

The previous prime is 21713023. The next prime is 21713033. The reversal of 21713030 is 3031712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21713033) 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, 455 + ... + 6605.

It is an arithmetic number, because the mean of its divisors is an integer number (2450034).

Almost surely, 2^21713030 is an apocalyptic number.

21713030 is a deficient number, since it is larger than the sum of its proper divisors (17487514).

21713030 is a wasteful number, since it uses less digits than its factorization.

21713030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6511.

The product of its (nonzero) digits is 126, while the sum is 17.

The square root of 21713030 is about 4659.7242407679. The cubic root of 21713030 is about 278.9802617897.

Adding to 21713030 its reverse (3031712), we get a palindrome (24744742).

The spelling of 21713030 in words is "twenty-one million, seven hundred thirteen thousand, thirty".