21488055471 has 24 divisors (see below), whose sum is σ = 32928770160. Its totient is φ = 13456164096.

The previous prime is 21488055469. The next prime is 21488055473. The reversal of 21488055471 is 17455088412.

21488055471 is a `hidden beast` number, since 2 + 14 + 8 + 80 + 554 + 7 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (21488055469) and next prime (21488055473).

It is not a de Polignac number, because 21488055471 - 2¹ = 21488055469 is a prime.

It is a super-3 number, since 3×21488055471³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21488055473) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60085 + ... + 215838.

It is an arithmetic number, because the mean of its divisors is an integer number (1372032090).

Almost surely, 2^21488055471 is an apocalyptic number.

21488055471 is a deficient number, since it is larger than the sum of its proper divisors (11440714689).

21488055471 is a wasteful number, since it uses less digits than its factorization.

21488055471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276455 (or 276452 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 45.

The spelling of 21488055471 in words is "twenty-one billion, four hundred eighty-eight million, fifty-five thousand, four hundred seventy-one".