21020022211021 has 2 divisors, whose sum is σ = 21020022211022. Its totient is φ = 21020022211020.

The previous prime is 21020022210983. The next prime is 21020022211037. The reversal of 21020022211021 is 12011222002012.

It is a happy number.

It is an a-pointer prime, because the next prime (21020022211037) can be obtained adding 21020022211021 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16077132736900 + 4942889474121 = 4009630^2 + 2223261^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020022211021 - 2¹⁷ = 21020022079949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21020022210986 and 21020022211004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020022211081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510011105510 + 10510011105511.

It is an arithmetic number, because the mean of its divisors is an integer number (10510011105511).

Almost surely, 2^{21020022211021} is an apocalyptic number.

It is an amenable number.

21020022211021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020022211021 is an equidigital number, since it uses as much as digits as its factorization.

21020022211021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21020022211021 its reverse (12011222002012), we get a palindrome (33031244213033).

The spelling of 21020022211021 in words is "twenty-one trillion, twenty billion, twenty-two million, two hundred eleven thousand, twenty-one".