21212326950055 has 16 divisors (see below), whose sum is σ = 26996957244864. Its totient is φ = 15965942446080.

The previous prime is 21212326950041. The next prime is 21212326950077. The reversal of 21212326950055 is 55005962321212.

It is a happy number.

It is not a de Polignac number, because 21212326950055 - 2³³ = 21203737015463 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21212326949993 and 21212326950020.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1511919354 + ... + 1511933383.

It is an arithmetic number, because the mean of its divisors is an integer number (1687309827804).

Almost surely, 2^{21212326950055} is an apocalyptic number.

21212326950055 is a deficient number, since it is larger than the sum of its proper divisors (5784630294809).

21212326950055 is a wasteful number, since it uses less digits than its factorization.

21212326950055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3023852826.

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 21212326950055 in words is "twenty-one trillion, two hundred twelve billion, three hundred twenty-six million, nine hundred fifty thousand, fifty-five".