212021111251 has 2 divisors, whose sum is σ = 212021111252. Its totient is φ = 212021111250.

The previous prime is 212021111201. The next prime is 212021111257. The reversal of 212021111251 is 152111120212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212021111251 - 2⁷ = 212021111123 is a prime.

It is a super-2 number, since 2×212021111251² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212021111257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010555625 + 106010555626.

It is an arithmetic number, because the mean of its divisors is an integer number (106010555626).

Almost surely, 2^212021111251 is an apocalyptic number.

212021111251 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021111251 is an equidigital number, since it uses as much as digits as its factorization.

212021111251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 19.

Adding to 212021111251 its reverse (152111120212), we get a palindrome (364132231463).

The spelling of 212021111251 in words is "two hundred twelve billion, twenty-one million, one hundred eleven thousand, two hundred fifty-one".