21441651 has 16 divisors (see below), whose sum is σ = 35643648. Its totient is φ = 11138400.

The previous prime is 21441617. The next prime is 21441661. The reversal of 21441651 is 15614412.

It is a happy number.

It is not a de Polignac number, because 21441651 - 2⁶ = 21441587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21441661) 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 in 15 ways as a sum of consecutive naturals, for example, 46180 + ... + 46641.

It is an arithmetic number, because the mean of its divisors is an integer number (2227728).

Almost surely, 2^21441651 is an apocalyptic number.

21441651 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21441651 is a deficient number, since it is larger than the sum of its proper divisors (14201997).

21441651 is a wasteful number, since it uses less digits than its factorization.

21441651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92842.

The product of its digits is 960, while the sum is 24.

The square root of 21441651 is about 4630.5130385304. The cubic root of 21441651 is about 277.8131130101.

The spelling of 21441651 in words is "twenty-one million, four hundred forty-one thousand, six hundred fifty-one".