21626036 has 24 divisors (see below), whose sum is σ = 38540040. Its totient is φ = 10616832.

The previous prime is 21626029. The next prime is 21626039. The reversal of 21626036 is 63062612.

It can be written as a sum of positive squares in 4 ways, for example, as 8737936 + 12888100 = 2956^2 + 3590^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21625996 and 21626014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21626039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84020 + ... + 84276.

It is an arithmetic number, because the mean of its divisors is an integer number (1605835).

Almost surely, 2^21626036 is an apocalyptic number.

It is an amenable number.

21626036 is a deficient number, since it is larger than the sum of its proper divisors (16914004).

21626036 is a wasteful number, since it uses less digits than its factorization.

21626036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563 (or 561 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 21626036 is about 4650.3801995106. The cubic root of 21626036 is about 278.6071817609.

Adding to 21626036 its reverse (63062612), we get a palindrome (84688648).

The spelling of 21626036 in words is "twenty-one million, six hundred twenty-six thousand, thirty-six".