21454450152340 has 48 divisors (see below), whose sum is σ = 45540905566464. Its totient is φ = 8489573568000.

The previous prime is 21454450152313. The next prime is 21454450152349. The reversal of 21454450152340 is 4325105445412.

It is a junction number, because it is equal to n+sod(n) for n = 21454450152293 and 21454450152302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21454450152349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14011024 + ... + 15466663.

It is an arithmetic number, because the mean of its divisors is an integer number (948768865968).

Almost surely, 2^{21454450152340} is an apocalyptic number.

21454450152340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21454450152340 is an abundant number, since it is smaller than the sum of its proper divisors (24086455414124).

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

21454450152340 is a wasteful number, since it uses less digits than its factorization.

21454450152340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29478088 (or 29478086 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 40.

Adding to 21454450152340 its reverse (4325105445412), we get a palindrome (25779555597752).

The spelling of 21454450152340 in words is "twenty-one trillion, four hundred fifty-four billion, four hundred fifty million, one hundred fifty-two thousand, three hundred forty".