21461534441 has 4 divisors (see below), whose sum is σ = 21486006852. Its totient is φ = 21437062032.

The previous prime is 21461534431. The next prime is 21461534459. The reversal of 21461534441 is 14443516412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15925430416 + 5536104025 = 126196^2 + 74405^2 .

It is a cyclic number.

It is not a de Polignac number, because 21461534441 - 2¹⁰ = 21461533417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21461534431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12234890 + ... + 12236643.

It is an arithmetic number, because the mean of its divisors is an integer number (5371501713).

Almost surely, 2^21461534441 is an apocalyptic number.

It is an amenable number.

21461534441 is a deficient number, since it is larger than the sum of its proper divisors (24472411).

21461534441 is an equidigital number, since it uses as much as digits as its factorization.

21461534441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24472410.

The product of its digits is 46080, while the sum is 35.

The spelling of 21461534441 in words is "twenty-one billion, four hundred sixty-one million, five hundred thirty-four thousand, four hundred forty-one".