131010204421 has 4 divisors (see below), whose sum is σ = 138716687052. Its totient is φ = 123303721792.

The previous prime is 131010204419. The next prime is 131010204427. The reversal of 131010204421 is 124402010131.

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 103755496321 + 27254708100 = 322111^2 + 165090^2 .

It is a cyclic number.

It is not a de Polignac number, because 131010204421 - 2¹ = 131010204419 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 (131010204427) 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, 3853241290 + ... + 3853241323.

It is an arithmetic number, because the mean of its divisors is an integer number (34679171763).

Almost surely, 2^131010204421 is an apocalyptic number.

It is an amenable number.

131010204421 is a deficient number, since it is larger than the sum of its proper divisors (7706482631).

131010204421 is an equidigital number, since it uses as much as digits as its factorization.

131010204421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7706482630.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 131010204421 its reverse (124402010131), we get a palindrome (255412214552).

The spelling of 131010204421 in words is "one hundred thirty-one billion, ten million, two hundred four thousand, four hundred twenty-one".