20202211021 has 2 divisors, whose sum is σ = 20202211022. Its totient is φ = 20202211020.

The previous prime is 20202210989. The next prime is 20202211033. The reversal of 20202211021 is 12011220202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15497760100 + 4704450921 = 124490^2 + 68589^2 .

It is a cyclic number.

It is not a de Polignac number, because 20202211021 - 2⁵ = 20202210989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20202210992 and 20202211010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20202211091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101105510 + 10101105511.

It is an arithmetic number, because the mean of its divisors is an integer number (10101105511).

Almost surely, 2^20202211021 is an apocalyptic number.

It is an amenable number.

20202211021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20202211021 is an equidigital number, since it uses as much as digits as its factorization.

20202211021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20202211021 its reverse (12011220202), we get a palindrome (32213431223).

The spelling of 20202211021 in words is "twenty billion, two hundred two million, two hundred eleven thousand, twenty-one".