21061912 has 32 divisors (see below), whose sum is σ = 42048720. Its totient is φ = 9856000.

The previous prime is 21061907. The next prime is 21061949. The reversal of 21061912 is 21916012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33828 + ... + 34444.

Almost surely, 2^21061912 is an apocalyptic number.

It is an amenable number.

21061912 is a deficient number, since it is larger than the sum of its proper divisors (20986808).

21061912 is a wasteful number, since it uses less digits than its factorization.

21061912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891 (or 887 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 21061912 is about 4589.3258764224. The cubic root of 21061912 is about 276.1632794276.

Adding to 21061912 its reverse (21916012), we get a palindrome (42977924).

The spelling of 21061912 in words is "twenty-one million, sixty-one thousand, nine hundred twelve".