2122212021421 has 2 divisors, whose sum is σ = 2122212021422. Its totient is φ = 2122212021420.

The previous prime is 2122212021407. The next prime is 2122212021467. The reversal of 2122212021421 is 1241202122212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2089510724196 + 32701297225 = 1445514^2 + 180835^2 .

It is a cyclic number.

It is not a de Polignac number, because 2122212021421 - 2¹¹ = 2122212019373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2122212021392 and 2122212021401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2122212021221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061106010710 + 1061106010711.

It is an arithmetic number, because the mean of its divisors is an integer number (1061106010711).

Almost surely, 2^{2122212021421} is an apocalyptic number.

It is an amenable number.

2122212021421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2122212021421 is an equidigital number, since it uses as much as digits as its factorization.

2122212021421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 2122212021421 its reverse (1241202122212), we get a palindrome (3363414143633).

The spelling of 2122212021421 in words is "two trillion, one hundred twenty-two billion, two hundred twelve million, twenty-one thousand, four hundred twenty-one".