211212021071 has 2 divisors, whose sum is σ = 211212021072. Its totient is φ = 211212021070.

The previous prime is 211212021049. The next prime is 211212021101. The reversal of 211212021071 is 170120212112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211212021071 is a prime.

It is a super-2 number, since 2×211212021071² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211212021001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105606010535 + 105606010536.

It is an arithmetic number, because the mean of its divisors is an integer number (105606010536).

Almost surely, 2^211212021071 is an apocalyptic number.

211212021071 is a deficient number, since it is larger than the sum of its proper divisors (1).

211212021071 is an equidigital number, since it uses as much as digits as its factorization.

211212021071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 211212021071 its reverse (170120212112), we get a palindrome (381332233183).

The spelling of 211212021071 in words is "two hundred eleven billion, two hundred twelve million, twenty-one thousand, seventy-one".