21244101 has 24 divisors (see below), whose sum is σ = 30503520. Its totient is φ = 13147392.

The previous prime is 21244073. The next prime is 21244121. The reversal of 21244101 is 10144212.

It is not a de Polignac number, because 21244101 - 2⁹ = 21243589 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21244121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92655 + ... + 92883.

It is an arithmetic number, because the mean of its divisors is an integer number (1270980).

Almost surely, 2^21244101 is an apocalyptic number.

It is an amenable number.

21244101 is a deficient number, since it is larger than the sum of its proper divisors (9259419).

21244101 is a wasteful number, since it uses less digits than its factorization.

21244101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373 (or 356 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 21244101 is about 4609.1323478503. The cubic root of 21244101 is about 276.9572803135.

Adding to 21244101 its reverse (10144212), we get a palindrome (31388313).

The spelling of 21244101 in words is "twenty-one million, two hundred forty-four thousand, one hundred one".