21545113214 has 4 divisors (see below), whose sum is σ = 32317669824. Its totient is φ = 10772556606.

The previous prime is 21545113199. The next prime is 21545113241. The reversal of 21545113214 is 41231154512.

It is a happy number.

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

It is a Curzon number.

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, 5386278302 + ... + 5386278305.

It is an arithmetic number, because the mean of its divisors is an integer number (8079417456).

Almost surely, 2^21545113214 is an apocalyptic number.

21545113214 is a deficient number, since it is larger than the sum of its proper divisors (10772556610).

21545113214 is a wasteful number, since it uses less digits than its factorization.

21545113214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10772556609.

The product of its digits is 4800, while the sum is 29.

Adding to 21545113214 its reverse (41231154512), we get a palindrome (62776267726).

The spelling of 21545113214 in words is "twenty-one billion, five hundred forty-five million, one hundred thirteen thousand, two hundred fourteen".