21506662434534 has 32 divisors (see below), whose sum is σ = 44063480782464. Its totient is φ = 6994239114240.

The previous prime is 21506662434533. The next prime is 21506662434589. The reversal of 21506662434534 is 43543426660512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21506662434533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46974427 + ... + 47430054.

It is an arithmetic number, because the mean of its divisors is an integer number (1376983774452).

Almost surely, 2^{21506662434534} is an apocalyptic number.

21506662434534 is an abundant number, since it is smaller than the sum of its proper divisors (22556818347930).

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

21506662434534 is a wasteful number, since it uses less digits than its factorization.

21506662434534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94405412.

The product of its (nonzero) digits is 12441600, while the sum is 51.

The spelling of 21506662434534 in words is "twenty-one trillion, five hundred six billion, six hundred sixty-two million, four hundred thirty-four thousand, five hundred thirty-four".