21358268999144 has 128 divisors (see below), whose sum is σ = 50100640128000. Its totient is φ = 8292710845440.

The previous prime is 21358268999107. The next prime is 21358268999161. The reversal of 21358268999144 is 44199986285312.

It is a super-3 number, since 3×21358268999144³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1673445707 + ... + 1673458469.

It is an arithmetic number, because the mean of its divisors is an integer number (391411251000).

Almost surely, 2^{21358268999144} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21358268999144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25050320064000).

21358268999144 is an abundant number, since it is smaller than the sum of its proper divisors (28742371128856).

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

21358268999144 is a wasteful number, since it uses less digits than its factorization.

21358268999144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21943 (or 21939 counting only the distinct ones).

The product of its digits is 268738560, while the sum is 71.

The spelling of 21358268999144 in words is "twenty-one trillion, three hundred fifty-eight billion, two hundred sixty-eight million, nine hundred ninety-nine thousand, one hundred forty-four".