21220131301 has 4 divisors (see below), whose sum is σ = 21227803072. Its totient is φ = 21212459532.

The previous prime is 21220131299. The next prime is 21220131307. The reversal of 21220131301 is 10313102212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21220131301 - 2¹ = 21220131299 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220131307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3831735 + ... + 3837268.

It is an arithmetic number, because the mean of its divisors is an integer number (5306950768).

Almost surely, 2^21220131301 is an apocalyptic number.

It is an amenable number.

21220131301 is a deficient number, since it is larger than the sum of its proper divisors (7671771).

21220131301 is an equidigital number, since it uses as much as digits as its factorization.

21220131301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7671770.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21220131301 its reverse (10313102212), we get a palindrome (31533233513).

The spelling of 21220131301 in words is "twenty-one billion, two hundred twenty million, one hundred thirty-one thousand, three hundred one".