126345543621 has 32 divisors (see below), whose sum is σ = 184627484160. Its totient is φ = 76218753600.

The previous prime is 126345543613. The next prime is 126345543631.

126345543621 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 126345543621 - 2³ = 126345543613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126345543631) 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, 7014495 + ... + 7032483.

It is an arithmetic number, because the mean of its divisors is an integer number (5769608880).

Almost surely, 2^126345543621 is an apocalyptic number.

126345543621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

126345543621 is a deficient number, since it is larger than the sum of its proper divisors (58281940539).

126345543621 is a wasteful number, since it uses less digits than its factorization.

126345543621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18977.

The product of its digits is 518400, while the sum is 42.

It can be divided in two parts, 126345 and 543621, that added together give a palindrome (669966).

The spelling of 126345543621 in words is "one hundred twenty-six billion, three hundred forty-five million, five hundred forty-three thousand, six hundred twenty-one".