12643211234621 has 32 divisors (see below), whose sum is σ = 14171963160960. Its totient is φ = 11179976371200.

The previous prime is 12643211234543. The next prime is 12643211234627.

12643211234621 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 12643211234621 - 2¹⁸ = 12643210972477 is a prime.

It is a super-2 number, since 2×12643211234621² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12643211234627) 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, 157039745 + ... + 157120233.

It is an arithmetic number, because the mean of its divisors is an integer number (442873848780).

Almost surely, 2^{12643211234621} is an apocalyptic number.

12643211234621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12643211234621 is a deficient number, since it is larger than the sum of its proper divisors (1528751926339).

12643211234621 is a wasteful number, since it uses less digits than its factorization.

12643211234621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81917.

The product of its digits is 82944, while the sum is 38.

It can be divided in two parts, 1264321 and 1234621, that added together give a palindrome (2498942).

The spelling of 12643211234621 in words is "twelve trillion, six hundred forty-three billion, two hundred eleven million, two hundred thirty-four thousand, six hundred twenty-one".