21022022202121 has 2 divisors, whose sum is σ = 21022022202122. Its totient is φ = 21022022202120.

The previous prime is 21022022202113. The next prime is 21022022202133. The reversal of 21022022202121 is 12120222022012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18406802799225 + 2615219402896 = 4290315^2 + 1617164^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022022202121 - 2³ = 21022022202113 is a prime.

It is not a weakly prime, because it can be changed into another prime (21022022202101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511011101060 + 10511011101061.

It is an arithmetic number, because the mean of its divisors is an integer number (10511011101061).

Almost surely, 2^{21022022202121} is an apocalyptic number.

It is an amenable number.

21022022202121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022022202121 is an equidigital number, since it uses as much as digits as its factorization.

21022022202121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21022022202121 its reverse (12120222022012), we get a palindrome (33142244224133).

The spelling of 21022022202121 in words is "twenty-one trillion, twenty-two billion, twenty-two million, two hundred two thousand, one hundred twenty-one".