126821071321 has 24 divisors (see below), whose sum is σ = 148024458240. Its totient is φ = 108337424832.

The previous prime is 126821071309. The next prime is 126821071361. The reversal of 126821071321 is 123170128621.

It is not a de Polignac number, because 126821071321 - 2⁷ = 126821071193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126821071361) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28516120 + ... + 28520566.

It is an arithmetic number, because the mean of its divisors is an integer number (6167685760).

Almost surely, 2^126821071321 is an apocalyptic number.

It is an amenable number.

126821071321 is a deficient number, since it is larger than the sum of its proper divisors (21203386919).

126821071321 is a wasteful number, since it uses less digits than its factorization.

126821071321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6293 (or 6286 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

Adding to 126821071321 its reverse (123170128621), we get a palindrome (249991199942).

The spelling of 126821071321 in words is "one hundred twenty-six billion, eight hundred twenty-one million, seventy-one thousand, three hundred twenty-one".