21521240110 has 8 divisors (see below), whose sum is σ = 38738232216. Its totient is φ = 8608496040.

The previous prime is 21521240107. The next prime is 21521240129. The reversal of 21521240110 is 1104212512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1076061996 + ... + 1076062015.

It is an arithmetic number, because the mean of its divisors is an integer number (4842279027).

Almost surely, 2^21521240110 is an apocalyptic number.

21521240110 is a deficient number, since it is larger than the sum of its proper divisors (17216992106).

21521240110 is a wasteful number, since it uses less digits than its factorization.

21521240110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2152124018.

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 21521240110 its reverse (1104212512), we get a palindrome (22625452622).

The spelling of 21521240110 in words is "twenty-one billion, five hundred twenty-one million, two hundred forty thousand, one hundred ten".