21322641 has 16 divisors (see below), whose sum is σ = 30305664. Its totient is φ = 13288704.

The previous prime is 21322621. The next prime is 21322661. The reversal of 21322641 is 14622312.

It is an interprime number because it is at equal distance from previous prime (21322621) and next prime (21322661).

It is not a de Polignac number, because 21322641 - 2⁹ = 21322129 is a prime.

It is a super-3 number, since 3×21322641³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21322601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6676 + ... + 9338.

It is an arithmetic number, because the mean of its divisors is an integer number (1894104).

Almost surely, 2^21322641 is an apocalyptic number.

It is an amenable number.

21322641 is a deficient number, since it is larger than the sum of its proper divisors (8983023).

21322641 is a wasteful number, since it uses less digits than its factorization.

21322641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2840.

The product of its digits is 576, while the sum is 21.

The square root of 21322641 is about 4617.6445294111. The cubic root of 21322641 is about 277.2981666853.

Adding to 21322641 its reverse (14622312), we get a palindrome (35944953).

The spelling of 21322641 in words is "twenty-one million, three hundred twenty-two thousand, six hundred forty-one".