21045857811139 has 48 divisors (see below), whose sum is σ = 25275268462080. Its totient is φ = 17163452361600.

The previous prime is 21045857811131. The next prime is 21045857811229. The reversal of 21045857811139 is 93111875854012.

It is not a de Polignac number, because 21045857811139 - 2³ = 21045857811131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21045857811139.

It is not an unprimeable number, because it can be changed into a prime (21045857811131) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 96201199 + ... + 96419719.

It is an arithmetic number, because the mean of its divisors is an integer number (526568092960).

Almost surely, 2^{21045857811139} is an apocalyptic number.

21045857811139 is a deficient number, since it is larger than the sum of its proper divisors (4229410650941).

21045857811139 is a wasteful number, since it uses less digits than its factorization.

21045857811139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218832 (or 218801 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 55.

The spelling of 21045857811139 in words is "twenty-one trillion, forty-five billion, eight hundred fifty-seven million, eight hundred eleven thousand, one hundred thirty-nine".