21525026 has 16 divisors (see below), whose sum is σ = 34984224. Its totient is φ = 9893184.

The previous prime is 21525017. The next prime is 21525059. The reversal of 21525026 is 62052512.

It is a junction number, because it is equal to n+sod(n) for n = 21524992 and 21525010.

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, 5900 + ... + 8823.

It is an arithmetic number, because the mean of its divisors is an integer number (2186514).

Almost surely, 2^21525026 is an apocalyptic number.

21525026 is a deficient number, since it is larger than the sum of its proper divisors (13459198).

21525026 is a wasteful number, since it uses less digits than its factorization.

21525026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14785.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 21525026 is about 4639.5070858875. The cubic root of 21525026 is about 278.1727356688.

Adding to 21525026 its reverse (62052512), we get a palindrome (83577538).

The spelling of 21525026 in words is "twenty-one million, five hundred twenty-five thousand, twenty-six".