21125014 has 4 divisors (see below), whose sum is σ = 31687524. Its totient is φ = 10562506.

The previous prime is 21125003. The next prime is 21125029. The reversal of 21125014 is 41052112.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5281252 + ... + 5281255.

It is an arithmetic number, because the mean of its divisors is an integer number (7921881).

Almost surely, 2^21125014 is an apocalyptic number.

21125014 is a deficient number, since it is larger than the sum of its proper divisors (10562510).

21125014 is a wasteful number, since it uses less digits than its factorization.

21125014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10562509.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 21125014 is about 4596.1956007115. The cubic root of 21125014 is about 276.4388017513.

Adding to 21125014 its reverse (41052112), we get a palindrome (62177126).

The spelling of 21125014 in words is "twenty-one million, one hundred twenty-five thousand, fourteen".