21128158145305 has 16 divisors (see below), whose sum is σ = 26464805884800. Its totient is φ = 16162331188608.

The previous prime is 21128158145273. The next prime is 21128158145321. The reversal of 21128158145305 is 50354185182112.

It is a cyclic number.

It is not a de Polignac number, because 21128158145305 - 2⁵ = 21128158145273 is a prime.

It is a super-2 number, since 2×21128158145305² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29777787 + ... + 30479056.

It is an arithmetic number, because the mean of its divisors is an integer number (1654050367800).

Almost surely, 2^{21128158145305} is an apocalyptic number.

It is an amenable number.

21128158145305 is a deficient number, since it is larger than the sum of its proper divisors (5336647739495).

21128158145305 is a wasteful number, since it uses less digits than its factorization.

21128158145305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60259920.

The product of its (nonzero) digits is 384000, while the sum is 46.

The spelling of 21128158145305 in words is "twenty-one trillion, one hundred twenty-eight billion, one hundred fifty-eight million, one hundred forty-five thousand, three hundred five".