211255220 has 24 divisors (see below), whose sum is σ = 483967008. Its totient is φ = 76820000.

The previous prime is 211255217. The next prime is 211255241. The reversal of 211255220 is 22552112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 211255192 and 211255201.

It is a congruent number.

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, 479906 + ... + 480345.

It is an arithmetic number, because the mean of its divisors is an integer number (20165292).

Almost surely, 2^211255220 is an apocalyptic number.

211255220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211255220 is an abundant number, since it is smaller than the sum of its proper divisors (272711788).

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

211255220 is a wasteful number, since it uses less digits than its factorization.

211255220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960271 (or 960269 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 211255220 is about 14534.6214260984. The cubic root of 211255220 is about 595.5741180746.

The spelling of 211255220 in words is "two hundred eleven million, two hundred fifty-five thousand, two hundred twenty".