211220002120 has 32 divisors (see below), whose sum is σ = 475314334200. Its totient is φ = 84475675648.

The previous prime is 211220002117. The next prime is 211220002163. The reversal of 211220002120 is 21200022112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 210480923524 + 739078596 = 458782^2 + 27186^2 .

It is a super-2 number, since 2×211220002120² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211220002120.

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, 105025 + ... + 658384.

Almost surely, 2^211220002120 is an apocalyptic number.

211220002120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211220002120 is an abundant number, since it is smaller than the sum of its proper divisors (264094332080).

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

211220002120 is a wasteful number, since it uses less digits than its factorization.

211220002120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770337 (or 770333 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 211220002120 its reverse (21200022112), we get a palindrome (232420024232).

The spelling of 211220002120 in words is "two hundred eleven billion, two hundred twenty million, two thousand, one hundred twenty".