21011011003120 has 80 divisors (see below), whose sum is σ = 48955126814208. Its totient is φ = 8386424398080.

The previous prime is 21011011003091. The next prime is 21011011003181. The reversal of 21011011003120 is 2130011011012.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 21011011003120.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 884029477 + ... + 884053243.

Almost surely, 2^{21011011003120} is an apocalyptic number.

21011011003120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011011003120 is an abundant number, since it is smaller than the sum of its proper divisors (27944115811088).

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

21011011003120 is a wasteful number, since it uses less digits than its factorization.

21011011003120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46958 (or 46952 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21011011003120 its reverse (2130011011012), we get a palindrome (23141022014132).

The spelling of 21011011003120 in words is "twenty-one trillion, eleven billion, eleven million, three thousand, one hundred twenty".