21098432355 has 96 divisors (see below), whose sum is σ = 45574202880. Its totient is φ = 8093629440.

The previous prime is 21098432353. The next prime is 21098432359. The reversal of 21098432355 is 55323489012.

It is not a de Polignac number, because 21098432355 - 2¹ = 21098432353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21098432353) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 141151 + ... + 249239.

It is an arithmetic number, because the mean of its divisors is an integer number (474731280).

Almost surely, 2^21098432355 is an apocalyptic number.

21098432355 is an abundant number, since it is smaller than the sum of its proper divisors (24475770525).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21098432355 is a wasteful number, since it uses less digits than its factorization.

21098432355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108141 (or 108128 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 21098432355 in words is "twenty-one billion, ninety-eight million, four hundred thirty-two thousand, three hundred fifty-five".