21125116 has 12 divisors (see below), whose sum is σ = 37003288. Its totient is φ = 10552752.

The previous prime is 21125107. The next prime is 21125123. The reversal of 21125116 is 61152112.

It is a junction number, because it is equal to n+sod(n) for n = 21125093 and 21125102.

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, 4735 + ... + 8041.

Almost surely, 2^21125116 is an apocalyptic number.

It is an amenable number.

21125116 is a deficient number, since it is larger than the sum of its proper divisors (15878172).

21125116 is a wasteful number, since it uses less digits than its factorization.

21125116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4908 (or 4906 counting only the distinct ones).

The product of its digits is 120, while the sum is 19.

The square root of 21125116 is about 4596.2066968316. The cubic root of 21125116 is about 276.4392466695.

Adding to 21125116 its reverse (61152112), we get a palindrome (82277228).

The spelling of 21125116 in words is "twenty-one million, one hundred twenty-five thousand, one hundred sixteen".