21011121030 has 32 divisors (see below), whose sum is σ = 50461500384. Its totient is φ = 5599097856.

The previous prime is 21011121013. The next prime is 21011121059. The reversal of 21011121030 is 3012111012.

It is a junction number, because it is equal to n+sod(n) for n = 21011120997 and 21011121015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197419 + ... + 284598.

It is an arithmetic number, because the mean of its divisors is an integer number (1576921887).

Almost surely, 2^21011121030 is an apocalyptic number.

21011121030 is an abundant number, since it is smaller than the sum of its proper divisors (29450379354).

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

21011121030 is a wasteful number, since it uses less digits than its factorization.

21011121030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483480.

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

Adding to 21011121030 its reverse (3012111012), we get a palindrome (24023232042).

The spelling of 21011121030 in words is "twenty-one billion, eleven million, one hundred twenty-one thousand, thirty".