211421241 has 6 divisors (see below), whose sum is σ = 305386250. Its totient is φ = 140947488.

The previous prime is 211421237. The next prime is 211421251. The reversal of 211421241 is 142124112.

211421241 is a `hidden beast` number, since 2 + 1 + 1 + 421 + 241 = 666.

It can be written as a sum of positive squares in only one way, i.e., 206755641 + 4665600 = 14379^2 + 2160^2 .

It is not a de Polignac number, because 211421241 - 2² = 211421237 is a prime.

It is a super-2 number, since 2×211421241² = 89397882291960162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211421251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11745616 + ... + 11745633.

Almost surely, 2^211421241 is an apocalyptic number.

It is an amenable number.

211421241 is a deficient number, since it is larger than the sum of its proper divisors (93965009).

211421241 is a wasteful number, since it uses less digits than its factorization.

211421241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23491255 (or 23491252 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

The square root of 211421241 is about 14540.3315299205. The cubic root of 211421241 is about 595.7300935814.

Adding to 211421241 its reverse (142124112), we get a palindrome (353545353).

The spelling of 211421241 in words is "two hundred eleven million, four hundred twenty-one thousand, two hundred forty-one".