21101021120 has 28 divisors (see below), whose sum is σ = 50246807304. Its totient is φ = 8440408320.

The previous prime is 21101021047. The next prime is 21101021147. The reversal of 21101021120 is 2112010112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32970026 + ... + 32970665.

Almost surely, 2^21101021120 is an apocalyptic number.

21101021120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101021120 is an abundant number, since it is smaller than the sum of its proper divisors (29145786184).

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

21101021120 is an equidigital number, since it uses as much as digits as its factorization.

21101021120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65940708 (or 65940698 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21101021120 its reverse (2112010112), we get a palindrome (23213031232).

The spelling of 21101021120 in words is "twenty-one billion, one hundred one million, twenty-one thousand, one hundred twenty".