211020220 has 24 divisors (see below), whose sum is σ = 447449184. Its totient is φ = 83587776.

The previous prime is 211020163. The next prime is 211020233. The reversal of 211020220 is 22020112.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 211020197 and 211020206.

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, 49159 + ... + 53278.

It is an arithmetic number, because the mean of its divisors is an integer number (18643716).

Almost surely, 2^211020220 is an apocalyptic number.

211020220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211020220 is an abundant number, since it is smaller than the sum of its proper divisors (236428964).

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

211020220 is a wasteful number, since it uses less digits than its factorization.

211020220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102549 (or 102547 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 211020220 is about 14526.5350307635. The cubic root of 211020220 is about 595.3531975424.

Adding to 211020220 its reverse (22020112), we get a palindrome (233040332).

The spelling of 211020220 in words is "two hundred eleven million, twenty thousand, two hundred twenty".