21155143115445 has 16 divisors (see below), whose sum is σ = 33849436067520. Its totient is φ = 11282340633984.

The previous prime is 21155143115443. The next prime is 21155143115453. The reversal of 21155143115445 is 54451134155112.

It is not a de Polignac number, because 21155143115445 - 2¹ = 21155143115443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21155143115397 and 21155143115406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21155143115443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24712675 + ... + 25554384.

It is an arithmetic number, because the mean of its divisors is an integer number (2115589754220).

Almost surely, 2^{21155143115445} is an apocalyptic number.

It is an amenable number.

21155143115445 is a deficient number, since it is larger than the sum of its proper divisors (12694292952075).

21155143115445 is a wasteful number, since it uses less digits than its factorization.

21155143115445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50295124.

The product of its digits is 240000, while the sum is 42.

The spelling of 21155143115445 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred forty-three million, one hundred fifteen thousand, four hundred forty-five".