21441789 has 12 divisors (see below), whose sum is σ = 31012956. Its totient is φ = 14275392.

The previous prime is 21441769. The next prime is 21441857. The reversal of 21441789 is 98714412.

It can be written as a sum of positive squares in 2 ways, for example, as 4549689 + 16892100 = 2133^2 + 4110^2 .

It is not a de Polignac number, because 21441789 - 2⁷ = 21441661 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 (21441769) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9739 + ... + 11735.

It is an arithmetic number, because the mean of its divisors is an integer number (2584413).

Almost surely, 2^21441789 is an apocalyptic number.

It is an amenable number.

21441789 is a deficient number, since it is larger than the sum of its proper divisors (9571167).

21441789 is a wasteful number, since it uses less digits than its factorization.

21441789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3196 (or 3193 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 21441789 is about 4630.5279396630. The cubic root of 21441789 is about 277.8137090172.

The spelling of 21441789 in words is "twenty-one million, four hundred forty-one thousand, seven hundred eighty-nine".