21355055550862 has 32 divisors (see below), whose sum is σ = 37445988835584. Its totient is φ = 9025782115200.

The previous prime is 21355055550853. The next prime is 21355055550877. The reversal of 21355055550862 is 26805555055312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 343939314 + ... + 344001397.

It is an arithmetic number, because the mean of its divisors is an integer number (1170187151112).

Almost surely, 2^{21355055550862} is an apocalyptic number.

21355055550862 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21355055550862 is a deficient number, since it is larger than the sum of its proper divisors (16090933284722).

21355055550862 is a wasteful number, since it uses less digits than its factorization.

21355055550862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687940824.

The product of its (nonzero) digits is 9000000, while the sum is 52.

The spelling of 21355055550862 in words is "twenty-one trillion, three hundred fifty-five billion, fifty-five million, five hundred fifty thousand, eight hundred sixty-two".