21080449967500 has 480 divisors, whose sum is σ = 59024706048000. Its totient is φ = 6394338720000.

The previous prime is 21080449967483. The next prime is 21080449967527. The reversal of 21080449967500 is 576994408012.

21080449967500 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 2342528001 + ... + 2342536999.

It is an arithmetic number, because the mean of its divisors is an integer number (122968137600).

Almost surely, 2^{21080449967500} is an apocalyptic number.

21080449967500 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 21080449967500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29512353024000).

21080449967500 is an abundant number, since it is smaller than the sum of its proper divisors (37944256080500).

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

21080449967500 is a wasteful number, since it uses less digits than its factorization.

21080449967500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9367 (or 9350 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 21080449967500 in words is "twenty-one trillion, eighty billion, four hundred forty-nine million, nine hundred sixty-seven thousand, five hundred".