13101220421 has 4 divisors (see below), whose sum is σ = 13104593100. Its totient is φ = 13097847744.

The previous prime is 13101220381. The next prime is 13101220427. The reversal of 13101220421 is 12402210131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5820011521 + 7281208900 = 76289^2 + 85330^2 .

It is a cyclic number.

It is not a de Polignac number, because 13101220421 - 2²⁶ = 13034111557 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 13101220421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13101220427) 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, 1680506 + ... + 1688283.

It is an arithmetic number, because the mean of its divisors is an integer number (3276148275).

Almost surely, 2^13101220421 is an apocalyptic number.

It is an amenable number.

13101220421 is a deficient number, since it is larger than the sum of its proper divisors (3372679).

13101220421 is an equidigital number, since it uses as much as digits as its factorization.

13101220421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3372678.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 13101220421 its reverse (12402210131), we get a palindrome (25503430552).

The spelling of 13101220421 in words is "thirteen billion, one hundred one million, two hundred twenty thousand, four hundred twenty-one".