21506541426880 has 56 divisors (see below), whose sum is σ = 53439080128992. Its totient is φ = 8228589760512.

The previous prime is 21506541426847. The next prime is 21506541426893. The reversal of 21506541426880 is 8862414560512.

It is a super-2 number, since 2×21506541426880² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1461034857 + ... + 1461049576.

Almost surely, 2^{21506541426880} is an apocalyptic number.

21506541426880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21506541426880 is an abundant number, since it is smaller than the sum of its proper divisors (31932538702112).

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

21506541426880 is a wasteful number, since it uses less digits than its factorization.

21506541426880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2922084473 (or 2922084463 counting only the distinct ones).

The product of its (nonzero) digits is 3686400, while the sum is 52.

The spelling of 21506541426880 in words is "twenty-one trillion, five hundred six billion, five hundred forty-one million, four hundred twenty-six thousand, eight hundred eighty".