211230004421 has 2 divisors, whose sum is σ = 211230004422. Its totient is φ = 211230004420.

The previous prime is 211230004417. The next prime is 211230004423. The reversal of 211230004421 is 124400032112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169673143396 + 41556861025 = 411914^2 + 203855^2 .

It is a cyclic number.

It is not a de Polignac number, because 211230004421 - 2² = 211230004417 is a prime.

It is a super-2 number, since 2×211230004421² (a number of 23 digits) contains 22 as substring.

Together with 211230004423, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 211230004393 and 211230004402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211230004423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105615002210 + 105615002211.

It is an arithmetic number, because the mean of its divisors is an integer number (105615002211).

Almost surely, 2^211230004421 is an apocalyptic number.

It is an amenable number.

211230004421 is a deficient number, since it is larger than the sum of its proper divisors (1).

211230004421 is an equidigital number, since it uses as much as digits as its factorization.

211230004421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 211230004421 its reverse (124400032112), we get a palindrome (335630036533).

The spelling of 211230004421 in words is "two hundred eleven billion, two hundred thirty million, four thousand, four hundred twenty-one".