131021012421221 has 8 divisors (see below), whose sum is σ = 141648577335384. Its totient is φ = 120471879720960.

The previous prime is 131021012421217. The next prime is 131021012421239. The reversal of 131021012421221 is 122124210120131.

It can be written as a sum of positive squares in 4 ways, for example, as 74088539800900 + 56932472620321 = 8607470^2 + 7545361^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131021012421221 - 2² = 131021012421217 is a prime.

It is a super-2 number, since 2×131021012421221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131021012421251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19608050000 + ... + 19608056681.

It is an arithmetic number, because the mean of its divisors is an integer number (17706072166923).

Almost surely, 2^{131021012421221} is an apocalyptic number.

It is an amenable number.

131021012421221 is a deficient number, since it is larger than the sum of its proper divisors (10627564914163).

131021012421221 is a wasteful number, since it uses less digits than its factorization.

131021012421221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39216106951.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 131021012421221 its reverse (122124210120131), we get a palindrome (253145222541352).

The spelling of 131021012421221 in words is "one hundred thirty-one trillion, twenty-one billion, twelve million, four hundred twenty-one thousand, two hundred twenty-one".