211011221020 has 24 divisors (see below), whose sum is σ = 445058611200. Its totient is φ = 84035908032.

The previous prime is 211011220967. The next prime is 211011221021. The reversal of 211011221020 is 20122110112.

211011221020 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211011221021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23031580 + ... + 23040739.

It is an arithmetic number, because the mean of its divisors is an integer number (18544108800).

Almost surely, 2^211011221020 is an apocalyptic number.

211011221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211011221020 is an abundant number, since it is smaller than the sum of its proper divisors (234047390180).

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

211011221020 is a wasteful number, since it uses less digits than its factorization.

211011221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46072557 (or 46072555 counting only the distinct ones).

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

Adding to 211011221020 its reverse (20122110112), we get a palindrome (231133331132).

The spelling of 211011221020 in words is "two hundred eleven billion, eleven million, two hundred twenty-one thousand, twenty".