21453020530 has 8 divisors (see below), whose sum is σ = 38615436972. Its totient is φ = 8581208208.

The previous prime is 21453020497. The next prime is 21453020531. The reversal of 21453020530 is 3502035412.

It can be written as a sum of positive squares in 2 ways, for example, as 19751210521 + 1701810009 = 140539^2 + 41253^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21453020495 and 21453020504.

It is not an unprimeable number, because it can be changed into a prime (21453020531) 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, 1072651017 + ... + 1072651036.

Almost surely, 2^21453020530 is an apocalyptic number.

21453020530 is a deficient number, since it is larger than the sum of its proper divisors (17162416442).

21453020530 is a wasteful number, since it uses less digits than its factorization.

21453020530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2145302060.

The product of its (nonzero) digits is 3600, while the sum is 25.

Adding to 21453020530 its reverse (3502035412), we get a palindrome (24955055942).

The spelling of 21453020530 in words is "twenty-one billion, four hundred fifty-three million, twenty thousand, five hundred thirty".