21515453411244 has 48 divisors (see below), whose sum is σ = 54950775529440. Its totient is φ = 6511612631040.

The previous prime is 21515453411189. The next prime is 21515453411269. The reversal of 21515453411244 is 44211435451512.

It is a super-2 number, since 2×21515453411244² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21515453411196 and 21515453411205.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1130478789 + ... + 1130497820.

It is an arithmetic number, because the mean of its divisors is an integer number (1144807823530).

Almost surely, 2^{21515453411244} is an apocalyptic number.

It is an amenable number.

21515453411244 is an abundant number, since it is smaller than the sum of its proper divisors (33435322118196).

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

21515453411244 is a wasteful number, since it uses less digits than its factorization.

21515453411244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2260976690 (or 2260976688 counting only the distinct ones).

The product of its digits is 384000, while the sum is 42.

Adding to 21515453411244 its reverse (44211435451512), we get a palindrome (65726888862756).

The spelling of 21515453411244 in words is "twenty-one trillion, five hundred fifteen billion, four hundred fifty-three million, four hundred eleven thousand, two hundred forty-four".