21437837686573 has 32 divisors (see below), whose sum is σ = 27072815016960. Its totient is φ = 16490211154560.

The previous prime is 21437837686567. The next prime is 21437837686607. The reversal of 21437837686573 is 37568673873412.

It is not a de Polignac number, because 21437837686573 - 2¹⁷ = 21437837555501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21437837689573) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2265528 + ... + 6928801.

It is an arithmetic number, because the mean of its divisors is an integer number (846025469280).

Almost surely, 2^{21437837686573} is an apocalyptic number.

It is an amenable number.

21437837686573 is a deficient number, since it is larger than the sum of its proper divisors (5634977330387).

21437837686573 is a wasteful number, since it uses less digits than its factorization.

21437837686573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9194737.

The product of its digits is 853493760, while the sum is 70.

The spelling of 21437837686573 in words is "twenty-one trillion, four hundred thirty-seven billion, eight hundred thirty-seven million, six hundred eighty-six thousand, five hundred seventy-three".