21000211111220 has 48 divisors (see below), whose sum is σ = 48111498542016. Its totient is φ = 7636135008000.

The previous prime is 21000211111219. The next prime is 21000211111259. The reversal of 21000211111220 is 2211111200012.

It is a junction number, because it is equal to n+sod(n) for n = 21000211111195 and 21000211111204.

It is a congruent number.

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, 3641480 + ... + 7433760.

It is an arithmetic number, because the mean of its divisors is an integer number (1002322886292).

Almost surely, 2^{21000211111220} is an apocalyptic number.

21000211111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000211111220 is an abundant number, since it is smaller than the sum of its proper divisors (27111287430796).

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

21000211111220 is a wasteful number, since it uses less digits than its factorization.

21000211111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3817472 (or 3817470 counting only the distinct ones).

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

Adding to 21000211111220 its reverse (2211111200012), we get a palindrome (23211322311232).

The spelling of 21000211111220 in words is "twenty-one trillion, two hundred eleven million, one hundred eleven thousand, two hundred twenty".