21102444254 has 8 divisors (see below), whose sum is σ = 31944067320. Its totient is φ = 10454421816.

The previous prime is 21102444161. The next prime is 21102444263. The reversal of 21102444254 is 45244420112.

It is a happy number.

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 (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48399884 + ... + 48400319.

It is an arithmetic number, because the mean of its divisors is an integer number (3993008415).

Almost surely, 2^21102444254 is an apocalyptic number.

21102444254 is a deficient number, since it is larger than the sum of its proper divisors (10841623066).

21102444254 is a wasteful number, since it uses less digits than its factorization.

21102444254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96800314.

The product of its (nonzero) digits is 10240, while the sum is 29.

Adding to 21102444254 its reverse (45244420112), we get a palindrome (66346864366).

The spelling of 21102444254 in words is "twenty-one billion, one hundred two million, four hundred forty-four thousand, two hundred fifty-four".