21020030032 has 20 divisors (see below), whose sum is σ = 40820377780. Its totient is φ = 10485739008.

The previous prime is 21020030029. The next prime is 21020030071. The reversal of 21020030032 is 23003002012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12516239376 + 8503790656 = 111876^2 + 92216^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21020029994 and 21020030021.

It is a congruent number.

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, 1510107 + ... + 1523962.

It is an arithmetic number, because the mean of its divisors is an integer number (2041018889).

Almost surely, 2^21020030032 is an apocalyptic number.

It is an amenable number.

21020030032 is a deficient number, since it is larger than the sum of its proper divisors (19800347748).

21020030032 is a wasteful number, since it uses less digits than its factorization.

21020030032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3034510 (or 3034504 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

Adding to 21020030032 its reverse (23003002012), we get a palindrome (44023032044).

The spelling of 21020030032 in words is "twenty-one billion, twenty million, thirty thousand, thirty-two".