21500565214 has 4 divisors (see below), whose sum is σ = 32250847824. Its totient is φ = 10750282606.

The previous prime is 21500565211. The next prime is 21500565221. The reversal of 21500565214 is 41256500512.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21500565211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5375141302 + ... + 5375141305.

It is an arithmetic number, because the mean of its divisors is an integer number (8062711956).

Almost surely, 2^21500565214 is an apocalyptic number.

21500565214 is a deficient number, since it is larger than the sum of its proper divisors (10750282610).

21500565214 is a wasteful number, since it uses less digits than its factorization.

21500565214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10750282609.

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 21500565214 in words is "twenty-one billion, five hundred million, five hundred sixty-five thousand, two hundred fourteen".