21022136 has 8 divisors (see below), whose sum is σ = 39416520. Its totient is φ = 10511064.

The previous prime is 21022117. The next prime is 21022163. The reversal of 21022136 is 63122012.

21022136 is nontrivially palindromic in base 14.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1313876 + ... + 1313891.

It is an arithmetic number, because the mean of its divisors is an integer number (4927065).

Almost surely, 2^21022136 is an apocalyptic number.

It is an amenable number.

21022136 is a deficient number, since it is larger than the sum of its proper divisors (18394384).

21022136 is a wasteful number, since it uses less digits than its factorization.

21022136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2627773 (or 2627769 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 21022136 is about 4584.9902944281. The cubic root of 21022136 is about 275.9893225583.

Adding to 21022136 its reverse (63122012), we get a palindrome (84144148).

The spelling of 21022136 in words is "twenty-one million, twenty-two thousand, one hundred thirty-six".