21001130 has 8 divisors (see below), whose sum is σ = 37802052. Its totient is φ = 8400448.

The previous prime is 21001121. The next prime is 21001153. The reversal of 21001130 is 3110012.

It can be written as a sum of positive squares in 2 ways, for example, as 20857489 + 143641 = 4567^2 + 379^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21001130² = 882094922553800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050047 + ... + 1050066.

Almost surely, 2^21001130 is an apocalyptic number.

21001130 is a deficient number, since it is larger than the sum of its proper divisors (16800922).

21001130 is a wasteful number, since it uses less digits than its factorization.

21001130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100120.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 21001130 is about 4582.6989864053. The cubic root of 21001130 is about 275.8973660959.

Adding to 21001130 its reverse (3110012), we get a palindrome (24111142).

The spelling of 21001130 in words is "twenty-one million, one thousand, one hundred thirty".