21103734484980 has 768 divisors, whose sum is σ = 80229063720960. Its totient is φ = 4500837259776.

The previous prime is 21103734484961. The next prime is 21103734484997. The reversal of 21103734484980 is 8948443730112.

21103734484980 is a `hidden beast` number, since 2 + 1 + 1 + 0 + 3 + 73 + 4 + 484 + 98 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 1254448849 + ... + 1254465671.

It is an arithmetic number, because the mean of its divisors is an integer number (104464926720).

Almost surely, 2^{21103734484980} is an apocalyptic number.

21103734484980 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 21103734484980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40114531860480).

21103734484980 is an abundant number, since it is smaller than the sum of its proper divisors (59125329235980).

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

21103734484980 is a wasteful number, since it uses less digits than its factorization.

21103734484980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17225 (or 17217 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 21103734484980 in words is "twenty-one trillion, one hundred three billion, seven hundred thirty-four million, four hundred eighty-four thousand, nine hundred eighty".