21121034441 has 8 divisors (see below), whose sum is σ = 22898387400. Its totient is φ = 19365489792.

The previous prime is 21121034437. The next prime is 21121034471. The reversal of 21121034441 is 14443012112.

It can be written as a sum of positive squares in 4 ways, for example, as 297390025 + 20823644416 = 17245^2 + 144304^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21121034441 - 2² = 21121034437 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121034471) 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, 5450060 + ... + 5453933.

It is an arithmetic number, because the mean of its divisors is an integer number (2862298425).

Almost surely, 2^21121034441 is an apocalyptic number.

It is an amenable number.

21121034441 is a deficient number, since it is larger than the sum of its proper divisors (1777352959).

21121034441 is a wasteful number, since it uses less digits than its factorization.

21121034441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10904155.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 21121034441 its reverse (14443012112), we get a palindrome (35564046553).

The spelling of 21121034441 in words is "twenty-one billion, one hundred twenty-one million, thirty-four thousand, four hundred forty-one".