21050305145 has 8 divisors (see below), whose sum is σ = 25301178240. Its totient is φ = 16813036080.

The previous prime is 21050305127. The next prime is 21050305169. The reversal of 21050305145 is 54150305012.

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

It is a de Polignac number, because none of the positive numbers 2^k-21050305145 is a prime.

It is a super-2 number, since 2×21050305145² (a number of 21 digits) contains 22 as substring.

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, 3397601 + ... + 3403790.

It is an arithmetic number, because the mean of its divisors is an integer number (3162647280).

Almost surely, 2^21050305145 is an apocalyptic number.

It is an amenable number.

21050305145 is a deficient number, since it is larger than the sum of its proper divisors (4250873095).

21050305145 is an equidigital number, since it uses as much as digits as its factorization.

21050305145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6802015.

The product of its (nonzero) digits is 3000, while the sum is 26.

The spelling of 21050305145 in words is "twenty-one billion, fifty million, three hundred five thousand, one hundred forty-five".