21000211011220 has 24 divisors (see below), whose sum is σ = 50400506427264. Its totient is φ = 7200072346656.

The previous prime is 21000211011217. The next prime is 21000211011253. The reversal of 21000211011220 is 2211011200012.

It is a self number, because there is not a number n which added to its sum of digits gives 21000211011220.

It is a congruent number.

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, 75000753472 + ... + 75000753751.

It is an arithmetic number, because the mean of its divisors is an integer number (2100021101136).

Almost surely, 2^{21000211011220} is an apocalyptic number.

21000211011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000211011220 is an abundant number, since it is smaller than the sum of its proper divisors (29400295416044).

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

21000211011220 is a wasteful number, since it uses less digits than its factorization.

21000211011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150001507239 (or 150001507237 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21000211011220 its reverse (2211011200012), we get a palindrome (23211222211232).

The spelling of 21000211011220 in words is "twenty-one trillion, two hundred eleven million, eleven thousand, two hundred twenty".