126396931684321 has 3 divisors (see below), whose sum is σ = 126396942926961. Its totient is φ = 126396920441682.

The previous prime is 126396931684277. The next prime is 126396931684333. The reversal of 126396931684321 is 123486139693621.

The square root of 126396931684321 is 11242639.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-126396931684321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126396931684921) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5621320 + ... + 16863958.

It is an arithmetic number, because the mean of its divisors is an integer number (42132314308987).

Almost surely, 2^{126396931684321} is an apocalyptic number.

126396931684321 is the 11242639-th square number.

126396931684321 is the 5621320-th centered octagonal number.

It is an amenable number.

126396931684321 is a deficient number, since it is larger than the sum of its proper divisors (11242640).

126396931684321 is an frugal number, since it uses more digits than its factorization.

126396931684321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22485278 (or 11242639 counting only the distinct ones).

The product of its digits is 60466176, while the sum is 64.

The spelling of 126396931684321 in words is "one hundred twenty-six trillion, three hundred ninety-six billion, nine hundred thirty-one million, six hundred eighty-four thousand, three hundred twenty-one".