21643455434612 has 48 divisors (see below), whose sum is σ = 41508265747200. Its totient is φ = 9792965784960.

The previous prime is 21643455434603. The next prime is 21643455434633.

21643455434612 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49487189 + ... + 49922627.

It is an arithmetic number, because the mean of its divisors is an integer number (864755536400).

Almost surely, 2^{21643455434612} is an apocalyptic number.

21643455434612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21643455434612 is a deficient number, since it is larger than the sum of its proper divisors (19864810312588).

21643455434612 is a wasteful number, since it uses less digits than its factorization.

21643455434612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440616 (or 440614 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 50.

It can be divided in two parts, 2164345 and 5434612, that added together give a palindrome (7598957).

The spelling of 21643455434612 in words is "twenty-one trillion, six hundred forty-three billion, four hundred fifty-five million, four hundred thirty-four thousand, six hundred twelve".