21001200111120 has 40 divisors (see below), whose sum is σ = 65103720345216. Its totient is φ = 5600320029568.

The previous prime is 21001200111107. The next prime is 21001200111173. The reversal of 21001200111120 is 2111100210012.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×21001200111120² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21001200111096 and 21001200111105.

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, 43752499992 + ... + 43752500471.

Almost surely, 2^{21001200111120} is an apocalyptic number.

21001200111120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001200111120 is an abundant number, since it is smaller than the sum of its proper divisors (44102520234096).

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

21001200111120 is a wasteful number, since it uses less digits than its factorization.

21001200111120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87505000479 (or 87505000473 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21001200111120 its reverse (2111100210012), we get a palindrome (23112300321132).

The spelling of 21001200111120 in words is "twenty-one trillion, one billion, two hundred million, one hundred eleven thousand, one hundred twenty".