21787535357103 has 32 divisors (see below), whose sum is σ = 30468402201600. Its totient is φ = 13822330959360.

The previous prime is 21787535357101. The next prime is 21787535357117. The reversal of 21787535357103 is 30175353578712.

It is a happy number.

It is not a de Polignac number, because 21787535357103 - 2¹ = 21787535357101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21787535357101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 150872713 + ... + 151017053.

It is an arithmetic number, because the mean of its divisors is an integer number (952137568800).

Almost surely, 2^{21787535357103} is an apocalyptic number.

21787535357103 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21787535357103 is a deficient number, since it is larger than the sum of its proper divisors (8680866844497).

21787535357103 is a wasteful number, since it uses less digits than its factorization.

21787535357103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155559.

The product of its (nonzero) digits is 18522000, while the sum is 57.

The spelling of 21787535357103 in words is "twenty-one trillion, seven hundred eighty-seven billion, five hundred thirty-five million, three hundred fifty-seven thousand, one hundred three".