21215478180984 has 32 divisors (see below), whose sum is σ = 53057863921920. Its totient is φ = 7069270264416.

The previous prime is 21215478180961. The next prime is 21215478181049. The reversal of 21215478180984 is 48908187451212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159669454 + ... + 159802269.

It is an arithmetic number, because the mean of its divisors is an integer number (1658058247560).

Almost surely, 2^{21215478180984} is an apocalyptic number.

21215478180984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21215478180984 is an abundant number, since it is smaller than the sum of its proper divisors (31842385740936).

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

21215478180984 is a wasteful number, since it uses less digits than its factorization.

21215478180984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319474499 (or 319474495 counting only the distinct ones).

The product of its (nonzero) digits is 10321920, while the sum is 60.

The spelling of 21215478180984 in words is "twenty-one trillion, two hundred fifteen billion, four hundred seventy-eight million, one hundred eighty thousand, nine hundred eighty-four".