21043727001436 has 6 divisors (see below), whose sum is σ = 36826522252520. Its totient is φ = 10521863500716.

The previous prime is 21043727001433. The next prime is 21043727001457. The reversal of 21043727001436 is 63410072734012.

It is a super-2 number, since 2×21043727001436² (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 (21043727001433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2630465875176 + ... + 2630465875183.

Almost surely, 2^{21043727001436} is an apocalyptic number.

It is an amenable number.

21043727001436 is a deficient number, since it is larger than the sum of its proper divisors (15782795251084).

21043727001436 is a wasteful number, since it uses less digits than its factorization.

21043727001436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5260931750363 (or 5260931750361 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 40.

Adding to 21043727001436 its reverse (63410072734012), we get a palindrome (84453799735448).

The spelling of 21043727001436 in words is "twenty-one trillion, forty-three billion, seven hundred twenty-seven million, one thousand, four hundred thirty-six".