21115223030 has 32 divisors (see below), whose sum is σ = 41508529920. Its totient is φ = 7669761120.

The previous prime is 21115223027. The next prime is 21115223039. The reversal of 21115223030 is 3032251112.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21115222993 and 21115223011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115223039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6050 + ... + 205589.

It is an arithmetic number, because the mean of its divisors is an integer number (1297141560).

Almost surely, 2^21115223030 is an apocalyptic number.

21115223030 is a deficient number, since it is larger than the sum of its proper divisors (20393306890).

21115223030 is a wasteful number, since it uses less digits than its factorization.

21115223030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212564.

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 21115223030 its reverse (3032251112), we get a palindrome (24147474142).

The spelling of 21115223030 in words is "twenty-one billion, one hundred fifteen million, two hundred twenty-three thousand, thirty".