21615566103480 has 256 divisors, whose sum is σ = 69843989698560. Its totient is φ = 5331774873600.

The previous prime is 21615566103479. The next prime is 21615566103487. The reversal of 21615566103480 is 8430166551612.

It is a super-2 number, since 2×21615566103480² (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 (21615566103487) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 153115087 + ... + 153256193.

It is an arithmetic number, because the mean of its divisors is an integer number (272828084760).

Almost surely, 2^{21615566103480} is an apocalyptic number.

21615566103480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21615566103480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34921994849280).

21615566103480 is an abundant number, since it is smaller than the sum of its proper divisors (48228423595080).

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

21615566103480 is a wasteful number, since it uses less digits than its factorization.

21615566103480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142430 (or 142426 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 48.

The spelling of 21615566103480 in words is "twenty-one trillion, six hundred fifteen billion, five hundred sixty-six million, one hundred three thousand, four hundred eighty".