21365025437598 has 16 divisors (see below), whose sum is σ = 42730525091856. Its totient is φ = 7121596109760.

The previous prime is 21365025437597. The next prime is 21365025437641. The reversal of 21365025437598 is 89573452056312.

It is a super-2 number, since 2×21365025437598² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365025437597) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19171993 + ... + 20255748.

It is an arithmetic number, because the mean of its divisors is an integer number (2670657818241).

It is a 2-persistent number, because it is pandigital, and so is 2⋅21365025437598 = 42730050875196, but 3⋅21365025437598 = 64095076312794 is not.

Almost surely, 2^{21365025437598} is an apocalyptic number.

21365025437598 is an abundant number, since it is smaller than the sum of its proper divisors (21365499654258).

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

21365025437598 is a wasteful number, since it uses less digits than its factorization.

21365025437598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39518059.

The product of its (nonzero) digits is 54432000, while the sum is 60.

The spelling of 21365025437598 in words is "twenty-one trillion, three hundred sixty-five billion, twenty-five million, four hundred thirty-seven thousand, five hundred ninety-eight".