21122220011021 has 2 divisors, whose sum is σ = 21122220011022. Its totient is φ = 21122220011020.

The previous prime is 21122220010943. The next prime is 21122220011027. The reversal of 21122220011021 is 12011002222112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21082515064900 + 39704946121 = 4591570^2 + 199261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21122220011021 is a prime.

It is a super-2 number, since 2×21122220011021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21122220011027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561110005510 + 10561110005511.

It is an arithmetic number, because the mean of its divisors is an integer number (10561110005511).

Almost surely, 2^{21122220011021} is an apocalyptic number.

It is an amenable number.

21122220011021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122220011021 is an equidigital number, since it uses as much as digits as its factorization.

21122220011021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21122220011021 its reverse (12011002222112), we get a palindrome (33133222233133).

The spelling of 21122220011021 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twenty million, eleven thousand, twenty-one".