21034453045 has 4 divisors (see below), whose sum is σ = 25241343660. Its totient is φ = 16827562432.

The previous prime is 21034453009. The next prime is 21034453049. The reversal of 21034453045 is 54035443012.

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 3131745444 + 17902707601 = 55962^2 + 133801^2 .

It is a cyclic number.

It is not a de Polignac number, because 21034453045 - 2⁹ = 21034452533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21034452998 and 21034453016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034453049) 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, 2103445300 + ... + 2103445309.

It is an arithmetic number, because the mean of its divisors is an integer number (6310335915).

Almost surely, 2^21034453045 is an apocalyptic number.

It is an amenable number.

21034453045 is a deficient number, since it is larger than the sum of its proper divisors (4206890615).

21034453045 is an equidigital number, since it uses as much as digits as its factorization.

21034453045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4206890614.

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 21034453045 its reverse (54035443012), we get a palindrome (75069896057).

The spelling of 21034453045 in words is "twenty-one billion, thirty-four million, four hundred fifty-three thousand, forty-five".