126312213621 has 32 divisors (see below), whose sum is σ = 195095236608. Its totient is φ = 71842000640.

The previous prime is 126312213619. The next prime is 126312213641.

126312213621 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 126312213621 - 2¹ = 126312213619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126312213641) 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, 129765 + ... + 519098.

It is an arithmetic number, because the mean of its divisors is an integer number (6096726144).

Almost surely, 2^126312213621 is an apocalyptic number.

126312213621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

126312213621 is a deficient number, since it is larger than the sum of its proper divisors (68783022987).

126312213621 is a wasteful number, since it uses less digits than its factorization.

126312213621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649241.

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

It can be divided in two parts, 126312 and 213621, that added together give a palindrome (339933).

The spelling of 126312213621 in words is "one hundred twenty-six billion, three hundred twelve million, two hundred thirteen thousand, six hundred twenty-one".