21311100030 has 32 divisors (see below), whose sum is σ = 55796335488. Its totient is φ = 5166327200.

The previous prime is 21311099987. The next prime is 21311100037. The reversal of 21311100030 is 3000111312.

It is a junction number, because it is equal to n+sod(n) for n = 21311099979 and 21311100015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311100037) 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, 32289216 + ... + 32289875.

It is an arithmetic number, because the mean of its divisors is an integer number (1743635484).

Almost surely, 2^21311100030 is an apocalyptic number.

21311100030 is an abundant number, since it is smaller than the sum of its proper divisors (34485235458).

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

21311100030 is a wasteful number, since it uses less digits than its factorization.

21311100030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64579112.

The product of its (nonzero) digits is 18, while the sum is 12.

Adding to 21311100030 its reverse (3000111312), we get a palindrome (24311211342).

The spelling of 21311100030 in words is "twenty-one billion, three hundred eleven million, one hundred thousand, thirty".