21064589037785 has 16 divisors (see below), whose sum is σ = 26402363043840. Its totient is φ = 16103202329280.

The previous prime is 21064589037781. The next prime is 21064589037799. The reversal of 21064589037785 is 58773098546012.

It is not a de Polignac number, because 21064589037785 - 2² = 21064589037781 is a prime.

It is a super-2 number, since 2×21064589037785² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21064589037781) 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, 89584025 + ... + 89818854.

It is an arithmetic number, because the mean of its divisors is an integer number (1650147690240).

It is a 1-persistent number, because it is pandigital, but 2⋅21064589037785 = 42129178075570 is not.

Almost surely, 2^{21064589037785} is an apocalyptic number.

It is an amenable number.

21064589037785 is a deficient number, since it is larger than the sum of its proper divisors (5337774006055).

21064589037785 is a wasteful number, since it uses less digits than its factorization.

21064589037785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179403928.

The product of its (nonzero) digits is 101606400, while the sum is 65.

The spelling of 21064589037785 in words is "twenty-one trillion, sixty-four billion, five hundred eighty-nine million, thirty-seven thousand, seven hundred eighty-five".