20921586889073 has 16 divisors (see below), whose sum is σ = 22630086133200. Its totient is φ = 19227257072640.

The previous prime is 20921586889061. The next prime is 20921586889079. The reversal of 20921586889073 is 37098868512902.

It can be written as a sum of positive squares in 8 ways, for example, as 5805921564304 + 15115665324769 = 2409548^2 + 3887887^2 .

It is a cyclic number.

It is not a de Polignac number, because 20921586889073 - 2¹² = 20921586884977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20921586888994 and 20921586889012.

It is not an unprimeable number, because it can be changed into a prime (20921586889079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104335973 + ... + 104536301.

It is an arithmetic number, because the mean of its divisors is an integer number (1414380383325).

Almost surely, 2^{20921586889073} is an apocalyptic number.

It is an amenable number.

20921586889073 is a deficient number, since it is larger than the sum of its proper divisors (1708499244127).

20921586889073 is a wasteful number, since it uses less digits than its factorization.

20921586889073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235652.

The product of its (nonzero) digits is 104509440, while the sum is 68.

The spelling of 20921586889073 in words is "twenty trillion, nine hundred twenty-one billion, five hundred eighty-six million, eight hundred eighty-nine thousand, seventy-three".