21212022071 has 2 divisors, whose sum is σ = 21212022072. Its totient is φ = 21212022070.

The previous prime is 21212022019. The next prime is 21212022127. The reversal of 21212022071 is 17022021212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21212022071 is a prime.

It is a super-2 number, since 2×21212022071² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212021071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606011035 + 10606011036.

It is an arithmetic number, because the mean of its divisors is an integer number (10606011036).

Almost surely, 2^21212022071 is an apocalyptic number.

21212022071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212022071 is an equidigital number, since it uses as much as digits as its factorization.

21212022071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 21212022071 its reverse (17022021212), we get a palindrome (38234043283).

The spelling of 21212022071 in words is "twenty-one billion, two hundred twelve million, twenty-two thousand, seventy-one".