202111211020 has 24 divisors (see below), whose sum is σ = 424720191168. Its totient is φ = 80789884800.

The previous prime is 202111211009. The next prime is 202111211023. The reversal of 202111211020 is 20112111202.

It is not an unprimeable number, because it can be changed into a prime (202111211023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3382116 + ... + 3441355.

It is an arithmetic number, because the mean of its divisors is an integer number (17696674632).

Almost surely, 2^202111211020 is an apocalyptic number.

202111211020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

202111211020 is an abundant number, since it is smaller than the sum of its proper divisors (222608980148).

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

202111211020 is a wasteful number, since it uses less digits than its factorization.

202111211020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6824961 (or 6824959 counting only the distinct ones).

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

Adding to 202111211020 its reverse (20112111202), we get a palindrome (222223322222).

The spelling of 202111211020 in words is "two hundred two billion, one hundred eleven million, two hundred eleven thousand, twenty".