21000021001120 has 96 divisors (see below), whose sum is σ = 57250543004928. Its totient is φ = 7130104178688.

The previous prime is 21000021001109. The next prime is 21000021001171. The reversal of 21000021001120 is 2110012000012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 21000021001097 and 21000021001106.

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, 90904149 + ... + 91134868.

It is an arithmetic number, because the mean of its divisors is an integer number (596359822968).

Almost surely, 2^{21000021001120} is an apocalyptic number.

21000021001120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000021001120 is an abundant number, since it is smaller than the sum of its proper divisors (36250522003808).

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

21000021001120 is a wasteful number, since it uses less digits than its factorization.

21000021001120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182039142 (or 182039134 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21000021001120 its reverse (2110012000012), we get a palindrome (23110033001132).

The spelling of 21000021001120 in words is "twenty-one trillion, twenty-one million, one thousand, one hundred twenty".