21603422841 has 64 divisors (see below), whose sum is σ = 39720124416. Its totient is φ = 10079251200.

The previous prime is 21603422837. The next prime is 21603422861. The reversal of 21603422841 is 14822430612.

It is not a de Polignac number, because 21603422841 - 2² = 21603422837 is a prime.

It is a super-2 number, since 2×21603422841² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (21603422821) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13896 + ... + 208326.

It is an arithmetic number, because the mean of its divisors is an integer number (620626944).

Almost surely, 2^21603422841 is an apocalyptic number.

21603422841 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21603422841 is a deficient number, since it is larger than the sum of its proper divisors (18116701575).

21603422841 is a wasteful number, since it uses less digits than its factorization.

21603422841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194502.

The product of its (nonzero) digits is 18432, while the sum is 33.

It can be divided in two parts, 21603 and 422841, that added together give a palindrome (444444).

The spelling of 21603422841 in words is "twenty-one billion, six hundred three million, four hundred twenty-two thousand, eight hundred forty-one".