21003540441 has 8 divisors (see below), whose sum is σ = 30158929920. Its totient is φ = 12925255632.

The previous prime is 21003540403. The next prime is 21003540461. The reversal of 21003540441 is 14404530012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21003540441 - 2⁹ = 21003539929 is a prime.

It is a super-2 number, since 2×21003540441² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003540461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269276121 + ... + 269276198.

It is an arithmetic number, because the mean of its divisors is an integer number (3769866240).

Almost surely, 2^21003540441 is an apocalyptic number.

It is an amenable number.

21003540441 is a deficient number, since it is larger than the sum of its proper divisors (9155389479).

21003540441 is a wasteful number, since it uses less digits than its factorization.

21003540441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538552335.

The product of its (nonzero) digits is 1920, while the sum is 24.

The spelling of 21003540441 in words is "twenty-one billion, three million, five hundred forty thousand, four hundred forty-one".