21451041 has 8 divisors (see below), whose sum is σ = 31779360. Its totient is φ = 14300676.

The previous prime is 21451033. The next prime is 21451063. The reversal of 21451041 is 14015412.

It is not a de Polignac number, because 21451041 - 2³ = 21451033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21451081) 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, 397215 + ... + 397268.

It is an arithmetic number, because the mean of its divisors is an integer number (3972420).

Almost surely, 2^21451041 is an apocalyptic number.

It is an amenable number.

21451041 is a deficient number, since it is larger than the sum of its proper divisors (10328319).

21451041 is an equidigital number, since it uses as much as digits as its factorization.

21451041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794492 (or 794486 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 21451041 is about 4631.5268540731. The cubic root of 21451041 is about 277.8536615732.

Adding to 21451041 its reverse (14015412), we get a palindrome (35466453).

The spelling of 21451041 in words is "twenty-one million, four hundred fifty-one thousand, forty-one".