21454011 has 8 divisors (see below), whose sum is σ = 31783760. Its totient is φ = 14302656.

The previous prime is 21454007. The next prime is 21454019. The reversal of 21454011 is 11045412.

It is not a de Polignac number, because 21454011 - 2² = 21454007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21454019) 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, 397270 + ... + 397323.

It is an arithmetic number, because the mean of its divisors is an integer number (3972970).

Almost surely, 2^21454011 is an apocalyptic number.

21454011 is a deficient number, since it is larger than the sum of its proper divisors (10329749).

21454011 is an equidigital number, since it uses as much as digits as its factorization.

21454011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794602 (or 794596 counting only the distinct ones).

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

The square root of 21454011 is about 4631.8474715819. The cubic root of 21454011 is about 277.8664843743.

Adding to 21454011 its reverse (11045412), we get a palindrome (32499423).

The spelling of 21454011 in words is "twenty-one million, four hundred fifty-four thousand, eleven".