1020221110021 has 2 divisors, whose sum is σ = 1020221110022. Its totient is φ = 1020221110020.

The previous prime is 1020221109979. The next prime is 1020221110031. The reversal of 1020221110021 is 1200111220201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 878062702500 + 142158407521 = 937050^2 + 377039^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020221110021 - 2¹³ = 1020221101829 is a prime.

It is a super-2 number, since 2×1020221110021² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1020221109983 and 1020221110010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020221110031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510110555010 + 510110555011.

It is an arithmetic number, because the mean of its divisors is an integer number (510110555011).

Almost surely, 2^{1020221110021} is an apocalyptic number.

It is an amenable number.

1020221110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020221110021 is an equidigital number, since it uses as much as digits as its factorization.

1020221110021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1020221110021 its reverse (1200111220201), we get a palindrome (2220332330222).

The spelling of 1020221110021 in words is "one trillion, twenty billion, two hundred twenty-one million, one hundred ten thousand, twenty-one".