21136026 has 8 divisors (see below), whose sum is σ = 42272064. Its totient is φ = 7045340.

The previous prime is 21136007. The next prime is 21136039. The reversal of 21136026 is 62063112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

21136026 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21135993 and 21136011.

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, 1761330 + ... + 1761341.

It is an arithmetic number, because the mean of its divisors is an integer number (5284008).

Almost surely, 2^21136026 is an apocalyptic number.

21136026 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21136026 is a wasteful number, since it uses less digits than its factorization.

21136026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3522676.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 21136026 is about 4597.3933919124. The cubic root of 21136026 is about 276.4868272072.

Adding to 21136026 its reverse (62063112), we get a palindrome (83199138).

The spelling of 21136026 in words is "twenty-one million, one hundred thirty-six thousand, twenty-six".