211021010121220 has 96 divisors (see below), whose sum is σ = 481045761036288. Its totient is φ = 77292958966272.

The previous prime is 211021010121197. The next prime is 211021010121221. The reversal of 211021010121220 is 22121010120112.

It is a junction number, because it is equal to n+sod(n) for n = 211021010121194 and 211021010121203.

It is not an unprimeable number, because it can be changed into a prime (211021010121221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 287138154 + ... + 287872126.

It is an arithmetic number, because the mean of its divisors is an integer number (5010893344128).

Almost surely, 2^{211021010121220} is an apocalyptic number.

211021010121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211021010121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240522880518144).

211021010121220 is an abundant number, since it is smaller than the sum of its proper divisors (270024750915068).

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

211021010121220 is a wasteful number, since it uses less digits than its factorization.

211021010121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742829 (or 742827 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 211021010121220 its reverse (22121010120112), we get a palindrome (233142020241332).

The spelling of 211021010121220 in words is "two hundred eleven trillion, twenty-one billion, ten million, one hundred twenty-one thousand, two hundred twenty".