21043340889579 has 12 divisors (see below), whose sum is σ = 31137301154232. Its totient is φ = 13686725781600.

The previous prime is 21043340889469. The next prime is 21043340889629. The reversal of 21043340889579 is 97598804334012.

21043340889579 is a `hidden beast` number, since 2 + 1 + 0 + 433 + 40 + 8 + 8 + 95 + 79 = 666.

It is not a de Polignac number, because 21043340889579 - 2¹¹ = 21043340887531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21043340899579) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28514011677 + ... + 28514012414.

It is an arithmetic number, because the mean of its divisors is an integer number (2594775096186).

Almost surely, 2^{21043340889579} is an apocalyptic number.

21043340889579 is a deficient number, since it is larger than the sum of its proper divisors (10093960264653).

21043340889579 is a wasteful number, since it uses less digits than its factorization.

21043340889579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57028024138 (or 57028024135 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 63.

The spelling of 21043340889579 in words is "twenty-one trillion, forty-three billion, three hundred forty million, eight hundred eighty-nine thousand, five hundred seventy-nine".