21514223518 has 4 divisors (see below), whose sum is σ = 32271335280. Its totient is φ = 10757111758.

The previous prime is 21514223447. The next prime is 21514223557. The reversal of 21514223518 is 81532241512.

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 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, 5378555878 + ... + 5378555881.

It is an arithmetic number, because the mean of its divisors is an integer number (8067833820).

Almost surely, 2^21514223518 is an apocalyptic number.

21514223518 is a deficient number, since it is larger than the sum of its proper divisors (10757111762).

21514223518 is a wasteful number, since it uses less digits than its factorization.

21514223518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10757111761.

The product of its digits is 19200, while the sum is 34.

The spelling of 21514223518 in words is "twenty-one billion, five hundred fourteen million, two hundred twenty-three thousand, five hundred eighteen".