131021434423021 has 16 divisors (see below), whose sum is σ = 132576176355840. Its totient is φ = 129476232869040.

The previous prime is 131021434422979. The next prime is 131021434423037. The reversal of 131021434423021 is 120324434120131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 131021434423021 - 2¹¹ = 131021434420973 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 (131021434423091) 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, 116951890 + ... + 118066876.

It is an arithmetic number, because the mean of its divisors is an integer number (8286011022240).

Almost surely, 2^{131021434423021} is an apocalyptic number.

It is an amenable number.

131021434423021 is a deficient number, since it is larger than the sum of its proper divisors (1554741932819).

131021434423021 is a wasteful number, since it uses less digits than its factorization.

131021434423021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119264.

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 131021434423021 its reverse (120324434120131), we get a palindrome (251345868543152).

The spelling of 131021434423021 in words is "one hundred thirty-one trillion, twenty-one billion, four hundred thirty-four million, four hundred twenty-three thousand, twenty-one".