21211021000220 has 48 divisors (see below), whose sum is σ = 47174894605440. Its totient is φ = 7983367363584.

The previous prime is 21211021000199. The next prime is 21211021000229. The reversal of 21211021000220 is 2200012011212.

It is a junction number, because it is equal to n+sod(n) for n = 21211021000195 and 21211021000204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211021000229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6260279 + ... + 9033998.

It is an arithmetic number, because the mean of its divisors is an integer number (982810304280).

Almost surely, 2^{21211021000220} is an apocalyptic number.

21211021000220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211021000220 is an abundant number, since it is smaller than the sum of its proper divisors (25963873605220).

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

21211021000220 is a wasteful number, since it uses less digits than its factorization.

21211021000220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15298382 (or 15298380 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21211021000220 its reverse (2200012011212), we get a palindrome (23411033011432).

The spelling of 21211021000220 in words is "twenty-one trillion, two hundred eleven billion, twenty-one million, two hundred twenty", and thus it is an aban number.