21352036 has 6 divisors (see below), whose sum is σ = 37366070. Its totient is φ = 10676016.

The previous prime is 21352031. The next prime is 21352039. The reversal of 21352036 is 63025312.

It can be written as a sum of positive squares in only one way, i.e., 13734436 + 7617600 = 3706^2 + 2760^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21351998 and 21352016.

It is not an unprimeable number, because it can be changed into a prime (21352031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2669001 + ... + 2669008.

Almost surely, 2^21352036 is an apocalyptic number.

It is an amenable number.

21352036 is a deficient number, since it is larger than the sum of its proper divisors (16014034).

21352036 is a wasteful number, since it uses less digits than its factorization.

21352036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5338013 (or 5338011 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 21352036 is about 4620.8263330275. The cubic root of 21352036 is about 277.4255342221.

Adding to 21352036 its reverse (63025312), we get a palindrome (84377348).

It can be divided in two parts, 2 and 1352036, that multiplied together give a palindrome (2704072).

The spelling of 21352036 in words is "twenty-one million, three hundred fifty-two thousand, thirty-six".