21875561254 has 4 divisors (see below), whose sum is σ = 32813341884. Its totient is φ = 10937780626.

The previous prime is 21875561219. The next prime is 21875561273. The reversal of 21875561254 is 45216557812.

It is a semiprime because it is the product of two 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 as a sum of consecutive naturals, namely, 5468890312 + ... + 5468890315.

It is an arithmetic number, because the mean of its divisors is an integer number (8203335471).

Almost surely, 2^21875561254 is an apocalyptic number.

21875561254 is a deficient number, since it is larger than the sum of its proper divisors (10937780630).

21875561254 is a wasteful number, since it uses less digits than its factorization.

21875561254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10937780629.

The product of its digits is 672000, while the sum is 46.

The spelling of 21875561254 in words is "twenty-one billion, eight hundred seventy-five million, five hundred sixty-one thousand, two hundred fifty-four".