21123211030 has 16 divisors (see below), whose sum is σ = 38056649904. Its totient is φ = 8441535520.

The previous prime is 21123211019. The next prime is 21123211051. The reversal of 21123211030 is 3011232112.

It is a junction number, because it is equal to n+sod(n) for n = 21123210995 and 21123211013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 957157 + ... + 978976.

It is an arithmetic number, because the mean of its divisors is an integer number (2378540619).

Almost surely, 2^21123211030 is an apocalyptic number.

21123211030 is a deficient number, since it is larger than the sum of its proper divisors (16933438874).

21123211030 is a wasteful number, since it uses less digits than its factorization.

21123211030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937231.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21123211030 its reverse (3011232112), we get a palindrome (24134443142).

The spelling of 21123211030 in words is "twenty-one billion, one hundred twenty-three million, two hundred eleven thousand, thirty".