211021122220 has 24 divisors (see below), whose sum is σ = 444196973808. Its totient is φ = 84207950400.

The previous prime is 211021122071. The next prime is 211021122253. The reversal of 211021122220 is 22221120112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 211021122194 and 211021122203.

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, 12522526 + ... + 12539365.

It is an arithmetic number, because the mean of its divisors is an integer number (18508207242).

Almost surely, 2^211021122220 is an apocalyptic number.

211021122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211021122220 is an abundant number, since it is smaller than the sum of its proper divisors (233175851588).

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

211021122220 is a wasteful number, since it uses less digits than its factorization.

211021122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25062321 (or 25062319 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 211021122220 its reverse (22221120112), we get a palindrome (233242242332).

The spelling of 211021122220 in words is "two hundred eleven billion, twenty-one million, one hundred twenty-two thousand, two hundred twenty".