131025421421 has 2 divisors, whose sum is σ = 131025421422. Its totient is φ = 131025421420.

The previous prime is 131025421379. The next prime is 131025421433. The reversal of 131025421421 is 124124520131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81532520521 + 49492900900 = 285539^2 + 222470^2 .

It is a cyclic number.

It is not a de Polignac number, because 131025421421 - 2⁶ = 131025421357 is a prime.

It is a super-2 number, since 2×131025421421² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131025421921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65512710710 + 65512710711.

It is an arithmetic number, because the mean of its divisors is an integer number (65512710711).

Almost surely, 2^131025421421 is an apocalyptic number.

It is an amenable number.

131025421421 is a deficient number, since it is larger than the sum of its proper divisors (1).

131025421421 is an equidigital number, since it uses as much as digits as its factorization.

131025421421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 131025421421 its reverse (124124520131), we get a palindrome (255149941552).

The spelling of 131025421421 in words is "one hundred thirty-one billion, twenty-five million, four hundred twenty-one thousand, four hundred twenty-one".