211421030251 has 2 divisors, whose sum is σ = 211421030252. Its totient is φ = 211421030250.

The previous prime is 211421030209. The next prime is 211421030311. The reversal of 211421030251 is 152030124112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211421030251 - 2⁹ = 211421029739 is a prime.

It is not a weakly prime, because it can be changed into another prime (211421030201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105710515125 + 105710515126.

It is an arithmetic number, because the mean of its divisors is an integer number (105710515126).

Almost surely, 2^211421030251 is an apocalyptic number.

211421030251 is a deficient number, since it is larger than the sum of its proper divisors (1).

211421030251 is an equidigital number, since it uses as much as digits as its factorization.

211421030251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 211421030251 its reverse (152030124112), we get a palindrome (363451154363).

The spelling of 211421030251 in words is "two hundred eleven billion, four hundred twenty-one million, thirty thousand, two hundred fifty-one".