21050555345 has 8 divisors (see below), whose sum is σ = 25616450880. Its totient is φ = 16603254640.

The previous prime is 21050555327. The next prime is 21050555353. The reversal of 21050555345 is 54355505012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21050555345 - 2¹⁴ = 21050538961 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29648315 + ... + 29649024.

It is an arithmetic number, because the mean of its divisors is an integer number (3202056360).

Almost surely, 2^21050555345 is an apocalyptic number.

It is an amenable number.

21050555345 is a deficient number, since it is larger than the sum of its proper divisors (4565895535).

21050555345 is an equidigital number, since it uses as much as digits as its factorization.

21050555345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59297415.

The product of its (nonzero) digits is 75000, while the sum is 35.

The spelling of 21050555345 in words is "twenty-one billion, fifty million, five hundred fifty-five thousand, three hundred forty-five".