21212021143 has 2 divisors, whose sum is σ = 21212021144. Its totient is φ = 21212021142.

The previous prime is 21212021123. The next prime is 21212021161. The reversal of 21212021143 is 34112021212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21212021143 - 2¹⁷ = 21211890071 is a prime.

It is a super-4 number, since 4×21212021143⁴ (a number of 42 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21212021143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212021123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606010571 + 10606010572.

It is an arithmetic number, because the mean of its divisors is an integer number (10606010572).

Almost surely, 2^21212021143 is an apocalyptic number.

21212021143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212021143 is an equidigital number, since it uses as much as digits as its factorization.

21212021143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21212021143 its reverse (34112021212), we get a palindrome (55324042355).

The spelling of 21212021143 in words is "twenty-one billion, two hundred twelve million, twenty-one thousand, one hundred forty-three".