126321123621 has 32 divisors (see below), whose sum is σ = 210983648256. Its totient is φ = 65310336000.

The previous prime is 126321123613. The next prime is 126321123647.

126321123621 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 126321123621 - 2³ = 126321123613 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126321123821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1247100 + ... + 1344581.

It is an arithmetic number, because the mean of its divisors is an integer number (6593239008).

Almost surely, 2^126321123621 is an apocalyptic number.

126321123621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

126321123621 is a deficient number, since it is larger than the sum of its proper divisors (84662524635).

126321123621 is a wasteful number, since it uses less digits than its factorization.

126321123621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591913.

The product of its digits is 5184, while the sum is 30.

It can be divided in two parts, 126321 and 123621, that added together give a palindrome (249942).

The spelling of 126321123621 in words is "one hundred twenty-six billion, three hundred twenty-one million, one hundred twenty-three thousand, six hundred twenty-one".