21550502544434 has 4 divisors (see below), whose sum is σ = 32325753816654. Its totient is φ = 10775251272216.

The previous prime is 21550502544433. The next prime is 21550502544491. The reversal of 21550502544434 is 43444520505512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13788411225625 + 7762091318809 = 3713275^2 + 2786053^2 .

It is not an unprimeable number, because it can be changed into a prime (21550502544433) by changing a digit.

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 as a sum of consecutive naturals, namely, 5387625636107 + ... + 5387625636110.

Almost surely, 2^{21550502544434} is an apocalyptic number.

21550502544434 is a deficient number, since it is larger than the sum of its proper divisors (10775251272220).

21550502544434 is a wasteful number, since it uses less digits than its factorization.

21550502544434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10775251272219.

The product of its (nonzero) digits is 1920000, while the sum is 44.

The spelling of 21550502544434 in words is "twenty-one trillion, five hundred fifty billion, five hundred two million, five hundred forty-four thousand, four hundred thirty-four".