211220321251 has 2 divisors, whose sum is σ = 211220321252. Its totient is φ = 211220321250.

The previous prime is 211220321233. The next prime is 211220321261. The reversal of 211220321251 is 152123022112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211220321251 - 2⁹ = 211220320739 is a prime.

It is a super-2 number, since 2×211220321251² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211220321261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610160625 + 105610160626.

It is an arithmetic number, because the mean of its divisors is an integer number (105610160626).

Almost surely, 2^211220321251 is an apocalyptic number.

211220321251 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220321251 is an equidigital number, since it uses as much as digits as its factorization.

211220321251 is an odious number, because the sum of its binary digits is odd.

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

Adding to 211220321251 its reverse (152123022112), we get a palindrome (363343343363).

The spelling of 211220321251 in words is "two hundred eleven billion, two hundred twenty million, three hundred twenty-one thousand, two hundred fifty-one".