21231302201 has 16 divisors (see below), whose sum is σ = 22203099600. Its totient is φ = 20276137728.

The previous prime is 21231302177. The next prime is 21231302237. The reversal of 21231302201 is 10220313212.

It can be written as a sum of positive squares in 8 ways, for example, as 747967801 + 20483334400 = 27349^2 + 143120^2 .

It is a cyclic number.

It is not a de Polignac number, because 21231302201 - 2²² = 21227107897 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21231302201.

It is not an unprimeable number, because it can be changed into a prime (21231302251) 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, 1932215 + ... + 1943171.

It is an arithmetic number, because the mean of its divisors is an integer number (1387693725).

Almost surely, 2^21231302201 is an apocalyptic number.

It is an amenable number.

21231302201 is a deficient number, since it is larger than the sum of its proper divisors (971797399).

21231302201 is a wasteful number, since it uses less digits than its factorization.

21231302201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11708.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21231302201 its reverse (10220313212), we get a palindrome (31451615413).

The spelling of 21231302201 in words is "twenty-one billion, two hundred thirty-one million, three hundred two thousand, two hundred one".