21548242071 has 6 divisors (see below), whose sum is σ = 31125238560. Its totient is φ = 14365494708.

The previous prime is 21548242069. The next prime is 21548242097. The reversal of 21548242071 is 17024284512.

21548242071 is a `hidden beast` number, since 2 + 1 + 548 + 2 + 42 + 0 + 71 = 666.

It is not a de Polignac number, because 21548242071 - 2¹ = 21548242069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21548242061) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1197124551 + ... + 1197124568.

It is an arithmetic number, because the mean of its divisors is an integer number (5187539760).

Almost surely, 2^21548242071 is an apocalyptic number.

21548242071 is a deficient number, since it is larger than the sum of its proper divisors (9576996489).

21548242071 is a wasteful number, since it uses less digits than its factorization.

21548242071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2394249125 (or 2394249122 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The spelling of 21548242071 in words is "twenty-one billion, five hundred forty-eight million, two hundred forty-two thousand, seventy-one".