211220030 has 32 divisors (see below), whose sum is σ = 440640000. Its totient is φ = 71396640.

The previous prime is 211220027. The next prime is 211220039. The reversal of 211220030 is 30022112.

It is a happy number.

It is a super-2 number, since 2×211220030² = 89227802146401800, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211219993 and 211220020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220039) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 16280 + ... + 26219.

It is an arithmetic number, because the mean of its divisors is an integer number (13770000).

Almost surely, 2^211220030 is an apocalyptic number.

211220030 is an abundant number, since it is smaller than the sum of its proper divisors (229419970).

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

211220030 is a wasteful number, since it uses less digits than its factorization.

211220030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42584.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 211220030 is about 14533.4108178363. The cubic root of 211220030 is about 595.5410468334.

Adding to 211220030 its reverse (30022112), we get a palindrome (241242142).

The spelling of 211220030 in words is "two hundred eleven million, two hundred twenty thousand, thirty".