21351108345729 has 16 divisors (see below), whose sum is σ = 29238899915712. Its totient is φ = 13848729928128.

The previous prime is 21351108345719. The next prime is 21351108345761. The reversal of 21351108345729 is 92754380115312.

It is not a de Polignac number, because 21351108345729 - 2⁸ = 21351108345473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21351108345719) 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, 2000419 + ... + 6834024.

It is an arithmetic number, because the mean of its divisors is an integer number (1827431244732).

Almost surely, 2^{21351108345729} is an apocalyptic number.

It is an amenable number.

21351108345729 is a deficient number, since it is larger than the sum of its proper divisors (7887791569983).

21351108345729 is a wasteful number, since it uses less digits than its factorization.

21351108345729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8856256.

The product of its (nonzero) digits is 1814400, while the sum is 51.

The spelling of 21351108345729 in words is "twenty-one trillion, three hundred fifty-one billion, one hundred eight million, three hundred forty-five thousand, seven hundred twenty-nine".