21545114140340 has 24 divisors (see below), whose sum is σ = 51708273937152. Its totient is φ = 7386896276640.

The previous prime is 21545114140331. The next prime is 21545114140369. The reversal of 21545114140340 is 4304141154512.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 21545114140340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76946836076 + ... + 76946836355.

It is an arithmetic number, because the mean of its divisors is an integer number (2154511414048).

Almost surely, 2^{21545114140340} is an apocalyptic number.

21545114140340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21545114140340 is an abundant number, since it is smaller than the sum of its proper divisors (30163159796812).

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

21545114140340 is a wasteful number, since it uses less digits than its factorization.

21545114140340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153893672447 (or 153893672445 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 35.

Adding to 21545114140340 its reverse (4304141154512), we get a palindrome (25849255294852).

The spelling of 21545114140340 in words is "twenty-one trillion, five hundred forty-five billion, one hundred fourteen million, one hundred forty thousand, three hundred forty".