21474641 has 2 divisors, whose sum is σ = 21474642. Its totient is φ = 21474640.

The previous prime is 21474637. The next prime is 21474647. The reversal of 21474641 is 14647412.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20611600 + 863041 = 4540^2 + 929^2 .

It is a cyclic number.

It is not a de Polignac number, because 21474641 - 2² = 21474637 is a prime.

It is a super-2 number, since 2×21474641² = 922320412157762, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21474647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10737320 + 10737321.

It is an arithmetic number, because the mean of its divisors is an integer number (10737321).

Almost surely, 2^21474641 is an apocalyptic number.

It is an amenable number.

21474641 is a deficient number, since it is larger than the sum of its proper divisors (1).

21474641 is an equidigital number, since it uses as much as digits as its factorization.

21474641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 29.

The square root of 21474641 is about 4634.0739096393. The cubic root of 21474641 is about 277.9555205480.

The spelling of 21474641 in words is "twenty-one million, four hundred seventy-four thousand, six hundred forty-one".