21625016 has 16 divisors (see below), whose sum is σ = 46339440. Its totient is φ = 9267840.

The previous prime is 21624973. The next prime is 21625027. The reversal of 21625016 is 61052612.

It is a junction number, because it is equal to n+sod(n) for n = 21624982 and 21625000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193025 + ... + 193136.

It is an arithmetic number, because the mean of its divisors is an integer number (2896215).

Almost surely, 2^21625016 is an apocalyptic number.

It is an amenable number.

21625016 is an abundant number, since it is smaller than the sum of its proper divisors (24714424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21625016 is a wasteful number, since it uses less digits than its factorization.

21625016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386174 (or 386170 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 21625016 is about 4650.2705297649. The cubic root of 21625016 is about 278.6028014884.

Adding to 21625016 its reverse (61052612), we get a palindrome (82677628).

The spelling of 21625016 in words is "twenty-one million, six hundred twenty-five thousand, sixteen".