21041481 has 8 divisors (see below), whose sum is σ = 29275200. Its totient is φ = 13417712.

The previous prime is 21041479. The next prime is 21041513. The reversal of 21041481 is 18414012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21041481 - 2¹ = 21041479 is a prime.

It is a super-2 number, since 2×21041481² = 885487845346722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21041411) 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, 152406 + ... + 152543.

It is an arithmetic number, because the mean of its divisors is an integer number (3659400).

Almost surely, 2^21041481 is an apocalyptic number.

It is an amenable number.

21041481 is a deficient number, since it is larger than the sum of its proper divisors (8233719).

21041481 is a wasteful number, since it uses less digits than its factorization.

21041481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304975.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 21041481 is about 4587.0994103028. The cubic root of 21041481 is about 276.0739536125.

Adding to 21041481 its reverse (18414012), we get a palindrome (39455493).

The spelling of 21041481 in words is "twenty-one million, forty-one thousand, four hundred eighty-one".