210020011220 has 24 divisors (see below), whose sum is σ = 441200277000. Its totient is φ = 83977860992.

The previous prime is 210020011193. The next prime is 210020011231. The reversal of 210020011220 is 22110020012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1483482256 + 208536528964 = 38516^2 + 456658^2 .

It is a super-2 number, since 2×210020011220² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 1826795 + ... + 1938354.

It is an arithmetic number, because the mean of its divisors is an integer number (18383344875).

Almost surely, 2^210020011220 is an apocalyptic number.

210020011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210020011220 is an abundant number, since it is smaller than the sum of its proper divisors (231180265780).

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

210020011220 is a wasteful number, since it uses less digits than its factorization.

210020011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3767947 (or 3767945 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 210020011220 its reverse (22110020012), we get a palindrome (232130031232).

The spelling of 210020011220 in words is "two hundred ten billion, twenty million, eleven thousand, two hundred twenty".