211424421 has 32 divisors (see below), whose sum is σ = 313223680. Its totient is φ = 126028224.

The previous prime is 211424417. The next prime is 211424431. The reversal of 211424421 is 124424112.

It is not a de Polignac number, because 211424421 - 2² = 211424417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211424431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 232650 + ... + 233556.

It is an arithmetic number, because the mean of its divisors is an integer number (9788240).

Almost surely, 2^211424421 is an apocalyptic number.

It is an amenable number.

211424421 is a deficient number, since it is larger than the sum of its proper divisors (101799259).

211424421 is a wasteful number, since it uses less digits than its factorization.

211424421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105.

The product of its digits is 512, while the sum is 21.

The square root of 211424421 is about 14540.4408805235. The cubic root of 211424421 is about 595.7330803708.

Adding to 211424421 its reverse (124424112), we get a palindrome (335848533).

The spelling of 211424421 in words is "two hundred eleven million, four hundred twenty-four thousand, four hundred twenty-one".