21544005502 has 4 divisors (see below), whose sum is σ = 32316008256. Its totient is φ = 10772002750.

The previous prime is 21544005491. The next prime is 21544005517. The reversal of 21544005502 is 20550044512.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5386001374 + ... + 5386001377.

It is an arithmetic number, because the mean of its divisors is an integer number (8079002064).

Almost surely, 2^21544005502 is an apocalyptic number.

21544005502 is a deficient number, since it is larger than the sum of its proper divisors (10772002754).

21544005502 is a wasteful number, since it uses less digits than its factorization.

21544005502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10772002753.

The product of its (nonzero) digits is 8000, while the sum is 28.

The spelling of 21544005502 in words is "twenty-one billion, five hundred forty-four million, five thousand, five hundred two".