21114566254 has 4 divisors (see below), whose sum is σ = 31671849384. Its totient is φ = 10557283126.

The previous prime is 21114566251. The next prime is 21114566269. The reversal of 21114566254 is 45266541112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21114566251) by changing a digit.

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, 5278641562 + ... + 5278641565.

It is an arithmetic number, because the mean of its divisors is an integer number (7917962346).

Almost surely, 2^21114566254 is an apocalyptic number.

21114566254 is a deficient number, since it is larger than the sum of its proper divisors (10557283130).

21114566254 is a wasteful number, since it uses less digits than its factorization.

21114566254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10557283129.

The product of its digits is 57600, while the sum is 37.

The spelling of 21114566254 in words is "twenty-one billion, one hundred fourteen million, five hundred sixty-six thousand, two hundred fifty-four".