21734756537745 has 16 divisors (see below), whose sum is σ = 34775774298432. Its totient is φ = 11591815540800.

The previous prime is 21734756537731. The next prime is 21734756537807. The reversal of 21734756537745 is 54773565743712.

It is a happy number.

It is not a de Polignac number, because 21734756537745 - 2⁴ = 21734756537729 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14127 + ... + 6593156.

It is an arithmetic number, because the mean of its divisors is an integer number (2173485893652).

Almost surely, 2^{21734756537745} is an apocalyptic number.

It is an amenable number.

21734756537745 is a deficient number, since it is larger than the sum of its proper divisors (13041017760687).

21734756537745 is a wasteful number, since it uses less digits than its factorization.

21734756537745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6826592.

The product of its digits is 518616000, while the sum is 66.

The spelling of 21734756537745 in words is "twenty-one trillion, seven hundred thirty-four billion, seven hundred fifty-six million, five hundred thirty-seven thousand, seven hundred forty-five".