21021123040443 has 16 divisors (see below), whose sum is σ = 31143269024640. Its totient is φ = 14013692992872.

The previous prime is 21021123040399. The next prime is 21021123040447. The reversal of 21021123040443 is 34404032112012.

21021123040443 is a `hidden beast` number, since 2 + 1 + 0 + 21 + 1 + 230 + 404 + 4 + 3 = 666.

It is not a de Polignac number, because 21021123040443 - 2¹⁴ = 21021123024059 is a prime.

It is a super-2 number, since 2×21021123040443² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21021123040447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9814221 + ... + 11762702.

It is an arithmetic number, because the mean of its divisors is an integer number (1946454314040).

Almost surely, 2^{21021123040443} is an apocalyptic number.

21021123040443 is a deficient number, since it is larger than the sum of its proper divisors (10122145984197).

21021123040443 is a wasteful number, since it uses less digits than its factorization.

21021123040443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21613015 (or 21613009 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 21021123040443 its reverse (34404032112012), we get a palindrome (55425155152455).

The spelling of 21021123040443 in words is "twenty-one trillion, twenty-one billion, one hundred twenty-three million, forty thousand, four hundred forty-three".