21043541145 has 32 divisors (see below), whose sum is σ = 36738800640. Its totient is φ = 10200635840.

The previous prime is 21043541119. The next prime is 21043541159. The reversal of 21043541145 is 54114534012.

It is not a de Polignac number, because 21043541145 - 2³⁰ = 19969799321 is a prime.

It is a super-2 number, since 2×21043541145² (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 31 ways as a sum of consecutive naturals, for example, 897076 + ... + 920234.

It is an arithmetic number, because the mean of its divisors is an integer number (1148087520).

Almost surely, 2^21043541145 is an apocalyptic number.

It is an amenable number.

21043541145 is a deficient number, since it is larger than the sum of its proper divisors (15695259495).

21043541145 is a wasteful number, since it uses less digits than its factorization.

21043541145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28685.

The product of its (nonzero) digits is 9600, while the sum is 30.

The spelling of 21043541145 in words is "twenty-one billion, forty-three million, five hundred forty-one thousand, one hundred forty-five".