21121876 has 12 divisors (see below), whose sum is σ = 37084320. Its totient is φ = 10526360.

The previous prime is 21121853. The next prime is 21121883. The reversal of 21121876 is 67812112.

It is a super-2 number, since 2×21121876² = 892267291518752, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7246 + ... + 9733.

It is an arithmetic number, because the mean of its divisors is an integer number (3090360).

Almost surely, 2^21121876 is an apocalyptic number.

It is an amenable number.

21121876 is a deficient number, since it is larger than the sum of its proper divisors (15962444).

21121876 is a wasteful number, since it uses less digits than its factorization.

21121876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17294 (or 17292 counting only the distinct ones).

The product of its digits is 1344, while the sum is 28.

The square root of 21121876 is about 4595.8542187498. The cubic root of 21121876 is about 276.4251132725.

Adding to 21121876 its reverse (67812112), we get a palindrome (88933988).

The spelling of 21121876 in words is "twenty-one million, one hundred twenty-one thousand, eight hundred seventy-six".