21252626 has 16 divisors (see below), whose sum is σ = 32572800. Its totient is φ = 10396848.

The previous prime is 21252617. The next prime is 21252653. The reversal of 21252626 is 62625212.

It is a super-2 number, since 2×21252626² = 903348223791752, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21252595 and 21252604.

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, 45671 + ... + 46133.

It is an arithmetic number, because the mean of its divisors is an integer number (2035800).

Almost surely, 2^21252626 is an apocalyptic number.

21252626 is a deficient number, since it is larger than the sum of its proper divisors (11320174).

21252626 is a wasteful number, since it uses less digits than its factorization.

21252626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913.

The product of its digits is 2880, while the sum is 26.

The square root of 21252626 is about 4610.0570495385. The cubic root of 21252626 is about 276.9943218914.

Adding to 21252626 its reverse (62625212), we get a palindrome (83877838).

The spelling of 21252626 in words is "twenty-one million, two hundred fifty-two thousand, six hundred twenty-six".