21000113254 has 8 divisors (see below), whose sum is σ = 31500785448. Its totient is φ = 10499851440.

The previous prime is 21000113249. The next prime is 21000113291. The reversal of 21000113254 is 45231100012.

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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141274 + ... + 248914.

It is an arithmetic number, because the mean of its divisors is an integer number (3937598181).

Almost surely, 2^21000113254 is an apocalyptic number.

21000113254 is a deficient number, since it is larger than the sum of its proper divisors (10500672194).

21000113254 is a wasteful number, since it uses less digits than its factorization.

21000113254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205190.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21000113254 its reverse (45231100012), we get a palindrome (66231213266).

The spelling of 21000113254 in words is "twenty-one billion, one hundred thirteen thousand, two hundred fifty-four".