21453231330 has 96 divisors (see below), whose sum is σ = 56062646640. Its totient is φ = 5691801600.

The previous prime is 21453231307. The next prime is 21453231409. The reversal of 21453231330 is 3313235412.

21453231330 is a `hidden beast` number, since 2 + 1 + 4 + 5 + 323 + 1 + 330 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 9693780849 + 11759450481 = 98457^2 + 108441^2 .

It is a super-2 number, since 2×21453231330² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21453231294 and 21453231303.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27752824 + ... + 27753596.

Almost surely, 2^21453231330 is an apocalyptic number.

21453231330 is an abundant number, since it is smaller than the sum of its proper divisors (34609415310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21453231330 is a wasteful number, since it uses less digits than its factorization.

21453231330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1956 (or 1953 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

Adding to 21453231330 its reverse (3313235412), we get a palindrome (24766466742).

The spelling of 21453231330 in words is "twenty-one billion, four hundred fifty-three million, two hundred thirty-one thousand, three hundred thirty".