21011103030 has 64 divisors (see below), whose sum is σ = 50642843328. Its totient is φ = 5578997760.

The previous prime is 21011103019. The next prime is 21011103041. The reversal of 21011103030 is 3030111012.

It is an interprime number because it is at equal distance from previous prime (21011103019) and next prime (21011103041).

It is a junction number, because it is equal to n+sod(n) for n = 21011102997 and 21011103015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7978594 + ... + 7981226.

It is an arithmetic number, because the mean of its divisors is an integer number (791294427).

Almost surely, 2^21011103030 is an apocalyptic number.

21011103030 is an abundant number, since it is smaller than the sum of its proper divisors (29631740298).

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

21011103030 is a wasteful number, since it uses less digits than its factorization.

21011103030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3681.

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

Adding to 21011103030 its reverse (3030111012), we get a palindrome (24041214042).

The spelling of 21011103030 in words is "twenty-one billion, eleven million, one hundred three thousand, thirty".