1220211 has 16 divisors (see below), whose sum is σ = 1851520. Its totient is φ = 793800.

The previous prime is 1220203. The next prime is 1220239. The reversal of 1220211 is 1120221.

1220211 = 74² + 75² + ... + 159².

It is not a de Polignac number, because 1220211 - 2³ = 1220203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220193 and 1220202.

It is not an unprimeable number, because it can be changed into a prime (1220251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 636 + ... + 1686.

It is an arithmetic number, because the mean of its divisors is an integer number (115720).

2^1220211 is an apocalyptic number.

1220211 is a deficient number, since it is larger than the sum of its proper divisors (631309).

1220211 is a wasteful number, since it uses less digits than its factorization.

1220211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103 (or 1097 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1220211 is about 1104.6316128013. The cubic root of 1220211 is about 106.8591327629.

Adding to 1220211 its reverse (1120221), we get a palindrome (2340432).

It can be divided in two parts, 1220 and 211, that added together give a triangular number (1431 = T₅₃).

The spelling of 1220211 in words is "one million, two hundred twenty thousand, two hundred eleven".