21741471 has 6 divisors (see below), whose sum is σ = 31404360. Its totient is φ = 14494308.

The previous prime is 21741469. The next prime is 21741481. The reversal of 21741471 is 17414712.

It is not a de Polignac number, because 21741471 - 2¹ = 21741469 is a prime.

It is a super-3 number, since 3×21741471³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21741431) 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, 1207851 + ... + 1207868.

It is an arithmetic number, because the mean of its divisors is an integer number (5234060).

Almost surely, 2^21741471 is an apocalyptic number.

21741471 is a deficient number, since it is larger than the sum of its proper divisors (9662889).

21741471 is a wasteful number, since it uses less digits than its factorization.

21741471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2415725 (or 2415722 counting only the distinct ones).

The product of its digits is 1568, while the sum is 27.

The square root of 21741471 is about 4662.7750321027. The cubic root of 21741471 is about 279.1020168802.

The spelling of 21741471 in words is "twenty-one million, seven hundred forty-one thousand, four hundred seventy-one".