21254472871 has 2 divisors, whose sum is σ = 21254472872. Its totient is φ = 21254472870.

The previous prime is 21254472851. The next prime is 21254472917. The reversal of 21254472871 is 17827445212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21254472871 - 2⁹ = 21254472359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21254472851) 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, 10627236435 + 10627236436.

It is an arithmetic number, because the mean of its divisors is an integer number (10627236436).

Almost surely, 2^21254472871 is an apocalyptic number.

21254472871 is a deficient number, since it is larger than the sum of its proper divisors (1).

21254472871 is an equidigital number, since it uses as much as digits as its factorization.

21254472871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 250880, while the sum is 43.

The spelling of 21254472871 in words is "twenty-one billion, two hundred fifty-four million, four hundred seventy-two thousand, eight hundred seventy-one".