21303135 has 32 divisors (see below), whose sum is σ = 43284480. Its totient is φ = 9738144.

The previous prime is 21303131. The next prime is 21303137. The reversal of 21303135 is 53130312.

It is not a de Polignac number, because 21303135 - 2² = 21303131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10327 + ... + 12216.

It is an arithmetic number, because the mean of its divisors is an integer number (1352640).

Almost surely, 2^21303135 is an apocalyptic number.

21303135 is an abundant number, since it is smaller than the sum of its proper divisors (21981345).

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

21303135 is a wasteful number, since it uses less digits than its factorization.

21303135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22564 (or 22558 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 21303135 is about 4615.5319303413. The cubic root of 21303135 is about 277.2135832252.

Adding to 21303135 its reverse (53130312), we get a palindrome (74433447).

The spelling of 21303135 in words is "twenty-one million, three hundred three thousand, one hundred thirty-five".