1101221021 has 2 divisors, whose sum is σ = 1101221022. Its totient is φ = 1101221020.

The previous prime is 1101221003. The next prime is 1101221039. The reversal of 1101221021 is 1201221011.

It is a balanced prime because it is at equal distance from previous prime (1101221003) and next prime (1101221039).

It can be written as a sum of positive squares in only one way, i.e., 1088340100 + 12880921 = 32990^2 + 3589^2 .

It is an emirp because it is prime and its reverse (1201221011) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1101221021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1101220993 and 1101221011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1101221521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550610510 + 550610511.

It is an arithmetic number, because the mean of its divisors is an integer number (550610511).

Almost surely, 2^1101221021 is an apocalyptic number.

It is an amenable number.

1101221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1101221021 is an equidigital number, since it uses as much as digits as its factorization.

1101221021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1101221021 is about 33184.6503823681. The cubic root of 1101221021 is about 1032.6619244312.

Adding to 1101221021 its reverse (1201221011), we get a palindrome (2302442032).

The spelling of 1101221021 in words is "one billion, one hundred one million, two hundred twenty-one thousand, twenty-one".