21013041 has 8 divisors (see below), whose sum is σ = 32019904. Its totient is φ = 12007440.

The previous prime is 21013021. The next prime is 21013043. The reversal of 21013041 is 14031012.

It is a happy number.

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

It is not a de Polignac number, because 21013041 - 2⁷ = 21012913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21013043) 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, 500290 + ... + 500331.

It is an arithmetic number, because the mean of its divisors is an integer number (4002488).

Almost surely, 2^21013041 is an apocalyptic number.

21013041 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21013041 is a deficient number, since it is larger than the sum of its proper divisors (11006863).

21013041 is a wasteful number, since it uses less digits than its factorization.

21013041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000631.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21013041 is about 4583.9983638741. The cubic root of 21013041 is about 275.9495155509.

Adding to 21013041 its reverse (14031012), we get a palindrome (35044053).

The spelling of 21013041 in words is "twenty-one million, thirteen thousand, forty-one".