21506734462055 has 8 divisors (see below), whose sum is σ = 26036471455632. Its totient is φ = 17053127502208.

The previous prime is 21506734462019. The next prime is 21506734462139. The reversal of 21506734462055 is 55026443760512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21506734462055 - 2¹⁴ = 21506734445671 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21506734461994 and 21506734462012.

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 7 ways as a sum of consecutive naturals, for example, 19032507809 + ... + 19032508938.

It is an arithmetic number, because the mean of its divisors is an integer number (3254558931954).

Almost surely, 2^{21506734462055} is an apocalyptic number.

21506734462055 is a deficient number, since it is larger than the sum of its proper divisors (4529736993577).

21506734462055 is a wasteful number, since it uses less digits than its factorization.

21506734462055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38065016865.

The product of its (nonzero) digits is 6048000, while the sum is 50.

The spelling of 21506734462055 in words is "twenty-one trillion, five hundred six billion, seven hundred thirty-four million, four hundred sixty-two thousand, fifty-five".