21727030 has 32 divisors (see below), whose sum is σ = 42575904. Its totient is φ = 7934976.

The previous prime is 21727009. The next prime is 21727081. The reversal of 21727030 is 3072712.

21727030 = T₁₀₃₆ + T₁₀₃₇ + ... + T₁₀₇₄.

It is a junction number, because it is equal to n+sod(n) for n = 21726992 and 21727010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11749 + ... + 13471.

It is an arithmetic number, because the mean of its divisors is an integer number (1330497).

Almost surely, 2^21727030 is an apocalyptic number.

21727030 is a deficient number, since it is larger than the sum of its proper divisors (20848874).

21727030 is a wasteful number, since it uses less digits than its factorization.

21727030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1840.

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 21727030 is about 4661.2262335141. The cubic root of 21727030 is about 279.0402086592.

Adding to 21727030 its reverse (3072712), we get a palindrome (24799742).

The spelling of 21727030 in words is "twenty-one million, seven hundred twenty-seven thousand, thirty".