21541054976 has 80 divisors (see below), whose sum is σ = 49377803904. Its totient is φ = 9196376064.

The previous prime is 21541054973. The next prime is 21541054979. The reversal of 21541054976 is 67945014512.

It is an interprime number because it is at equal distance from previous prime (21541054973) and next prime (21541054979).

It is not an unprimeable number, because it can be changed into a prime (21541054973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 931166 + ... + 954018.

Almost surely, 2^21541054976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21541054976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24688901952).

21541054976 is an abundant number, since it is smaller than the sum of its proper divisors (27836748928).

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

21541054976 is an equidigital number, since it uses as much as digits as its factorization.

21541054976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23141 (or 23125 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 21541054976 in words is "twenty-one billion, five hundred forty-one million, fifty-four thousand, nine hundred seventy-six".