21120021030 has 32 divisors (see below), whose sum is σ = 50700945888. Its totient is φ = 5630572800.

The previous prime is 21120021029. The next prime is 21120021037. The reversal of 21120021030 is 3012002112.

It is a junction number, because it is equal to n+sod(n) for n = 21120020997 and 21120021015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120021037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33090 + ... + 208170.

It is an arithmetic number, because the mean of its divisors is an integer number (1584404559).

Almost surely, 2^21120021030 is an apocalyptic number.

21120021030 is an abundant number, since it is smaller than the sum of its proper divisors (29580924858).

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

21120021030 is a wasteful number, since it uses less digits than its factorization.

21120021030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179112.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21120021030 its reverse (3012002112), we get a palindrome (24132023142).

The spelling of 21120021030 in words is "twenty-one billion, one hundred twenty million, twenty-one thousand, thirty".