21407041 has 2 divisors, whose sum is σ = 21407042. Its totient is φ = 21407040.

The previous prime is 21407039. The next prime is 21407093. The reversal of 21407041 is 14070412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20061441 + 1345600 = 4479^2 + 1160^2 .

It is a cyclic number.

It is not a de Polignac number, because 21407041 - 2¹ = 21407039 is a prime.

It is a super-2 number, since 2×21407041² = 916522808751362, which contains 22 as substring.

Together with 21407039, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21407011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10703520 + 10703521.

It is an arithmetic number, because the mean of its divisors is an integer number (10703521).

Almost surely, 2^21407041 is an apocalyptic number.

It is an amenable number.

21407041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21407041 is an equidigital number, since it uses as much as digits as its factorization.

21407041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 21407041 is about 4626.7743623393. The cubic root of 21407041 is about 277.6635553433.

Adding to 21407041 its reverse (14070412), we get a palindrome (35477453).

The spelling of 21407041 in words is "twenty-one million, four hundred seven thousand, forty-one".