21741081 has 8 divisors (see below), whose sum is σ = 29009664. Its totient is φ = 14483280.

The previous prime is 21741067. The next prime is 21741107. The reversal of 21741081 is 18014712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21741081 - 2¹³ = 21732889 is a prime.

It is a super-2 number, since 2×21741081² = 945349206097122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21741001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6375 + ... + 9171.

It is an arithmetic number, because the mean of its divisors is an integer number (3626208).

Almost surely, 2^21741081 is an apocalyptic number.

It is an amenable number.

21741081 is a deficient number, since it is larger than the sum of its proper divisors (7268583).

21741081 is a wasteful number, since it uses less digits than its factorization.

21741081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5391.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 21741081 is about 4662.7332113257. The cubic root of 21741081 is about 279.1003480198.

Adding to 21741081 its reverse (18014712), we get a palindrome (39755793).

The spelling of 21741081 in words is "twenty-one million, seven hundred forty-one thousand, eighty-one".