21311301 has 16 divisors (see below), whose sum is σ = 31076928. Its totient is φ = 12883200.

The previous prime is 21311261. The next prime is 21311347. The reversal of 21311301 is 10311312.

It is not a de Polignac number, because 21311301 - 2⁶ = 21311237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311701) 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, 21325 + ... + 22301.

It is an arithmetic number, because the mean of its divisors is an integer number (1942308).

Almost surely, 2^21311301 is an apocalyptic number.

It is an amenable number.

21311301 is a deficient number, since it is larger than the sum of its proper divisors (9765627).

21311301 is a wasteful number, since it uses less digits than its factorization.

21311301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 21311301 is about 4616.4164673478. The cubic root of 21311301 is about 277.2489995608.

Adding to 21311301 its reverse (10311312), we get a palindrome (31622613).

It can be divided in two parts, 21311 and 301, that added together give a palindrome (21612).

The spelling of 21311301 in words is "twenty-one million, three hundred eleven thousand, three hundred one".