21201135 has 16 divisors (see below), whose sum is σ = 34305120. Its totient is φ = 11179520.

The previous prime is 21201133. The next prime is 21201137. The reversal of 21201135 is 53110212.

It is an interprime number because it is at equal distance from previous prime (21201133) and next prime (21201137).

It is not a de Polignac number, because 21201135 - 2¹ = 21201133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6606 + ... + 9275.

It is an arithmetic number, because the mean of its divisors is an integer number (2144070).

Almost surely, 2^21201135 is an apocalyptic number.

21201135 is a deficient number, since it is larger than the sum of its proper divisors (13103985).

21201135 is a wasteful number, since it uses less digits than its factorization.

21201135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15978.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 21201135 is about 4604.4690247628. The cubic root of 21201135 is about 276.7704397735.

Adding to 21201135 its reverse (53110212), we get a palindrome (74311347).

The spelling of 21201135 in words is "twenty-one million, two hundred one thousand, one hundred thirty-five".