21231301 has 24 divisors (see below), whose sum is σ = 26668224. Its totient is φ = 16548480.

The previous prime is 21231269. The next prime is 21231307. The reversal of 21231301 is 10313212.

It is not a de Polignac number, because 21231301 - 2⁵ = 21231269 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231307) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154905 + ... + 155041.

It is an arithmetic number, because the mean of its divisors is an integer number (1111176).

Almost surely, 2^21231301 is an apocalyptic number.

It is an amenable number.

21231301 is a deficient number, since it is larger than the sum of its proper divisors (5436923).

21231301 is a wasteful number, since it uses less digits than its factorization.

21231301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21231301 is about 4607.7435909564. The cubic root of 21231301 is about 276.9016450195.

Adding to 21231301 its reverse (10313212), we get a palindrome (31544513).

It can be divided in two parts, 212 and 31301, that added together give a palindrome (31513).

The spelling of 21231301 in words is "twenty-one million, two hundred thirty-one thousand, three hundred one".