211210022021 has 2 divisors, whose sum is σ = 211210022022. Its totient is φ = 211210022020.

The previous prime is 211210022017. The next prime is 211210022047. The reversal of 211210022021 is 120220012112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132322065121 + 78887956900 = 363761^2 + 280870^2 .

It is a cyclic number.

It is not a de Polignac number, because 211210022021 - 2² = 211210022017 is a prime.

It is a super-2 number, since 2×211210022021² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211210021987 and 211210022005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211210022071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105605011010 + 105605011011.

It is an arithmetic number, because the mean of its divisors is an integer number (105605011011).

Almost surely, 2^211210022021 is an apocalyptic number.

It is an amenable number.

211210022021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211210022021 is an equidigital number, since it uses as much as digits as its factorization.

211210022021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 211210022021 its reverse (120220012112), we get a palindrome (331430034133).

Subtracting from 211210022021 its reverse (120220012112), we obtain a palindrome (90990009909).

The spelling of 211210022021 in words is "two hundred eleven billion, two hundred ten million, twenty-two thousand, twenty-one".