21453231332 has 12 divisors (see below), whose sum is σ = 40431089916. Its totient is φ = 9901491360.

The previous prime is 21453231307. The next prime is 21453231409. The reversal of 21453231332 is 23313235412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8088484096 + 13364747236 = 89936^2 + 115606^2 .

It is a super-2 number, since 2×21453231332² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21453231295 and 21453231304.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206281019 + ... + 206281122.

It is an arithmetic number, because the mean of its divisors is an integer number (3369257493).

Almost surely, 2^21453231332 is an apocalyptic number.

It is an amenable number.

21453231332 is a deficient number, since it is larger than the sum of its proper divisors (18977858584).

21453231332 is a wasteful number, since it uses less digits than its factorization.

21453231332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412562158 (or 412562156 counting only the distinct ones).

The product of its digits is 12960, while the sum is 29.

Adding to 21453231332 its reverse (23313235412), we get a palindrome (44766466744).

The spelling of 21453231332 in words is "twenty-one billion, four hundred fifty-three million, two hundred thirty-one thousand, three hundred thirty-two".