21121130 has 32 divisors (see below), whose sum is σ = 40030848. Its totient is φ = 8008000.

The previous prime is 21121129. The next prime is 21121171. The reversal of 21121130 is 3112112.

It is a super-2 number, since 2×21121130² = 892204264953800, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29780 + ... + 30480.

It is an arithmetic number, because the mean of its divisors is an integer number (1250964).

Almost surely, 2^21121130 is an apocalyptic number.

21121130 is a deficient number, since it is larger than the sum of its proper divisors (18909718).

21121130 is a wasteful number, since it uses less digits than its factorization.

21121130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 21121130 is about 4595.7730579305. The cubic root of 21121130 is about 276.4218588968.

Adding to 21121130 its reverse (3112112), we get a palindrome (24233242).

The spelling of 21121130 in words is "twenty-one million, one hundred twenty-one thousand, one hundred thirty".