21011120021120 has 64 divisors (see below), whose sum is σ = 52413609219840. Its totient is φ = 8039037219840.

The previous prime is 21011120021117. The next prime is 21011120021137. The reversal of 21011120021120 is 2112002111012.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 21011120021095 and 21011120021104.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 713678216 + ... + 713707655.

It is an arithmetic number, because the mean of its divisors is an integer number (818962644060).

Almost surely, 2^{21011120021120} is an apocalyptic number.

21011120021120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011120021120 is an abundant number, since it is smaller than the sum of its proper divisors (31402489198720).

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

21011120021120 is a wasteful number, since it uses less digits than its factorization.

21011120021120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427385913 (or 1427385901 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21011120021120 its reverse (2112002111012), we get a palindrome (23123122132132).

The spelling of 21011120021120 in words is "twenty-one trillion, eleven billion, one hundred twenty million, twenty-one thousand, one hundred twenty".