1111202222021 has 2 divisors, whose sum is σ = 1111202222022. Its totient is φ = 1111202222020.

The previous prime is 1111202221973. The next prime is 1111202222059. The reversal of 1111202222021 is 1202222021111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1062321876100 + 48880345921 = 1030690^2 + 221089^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111202222021 - 2⁶ = 1111202221957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111202227021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555601111010 + 555601111011.

It is an arithmetic number, because the mean of its divisors is an integer number (555601111011).

Almost surely, 2^{1111202222021} is an apocalyptic number.

It is an amenable number.

1111202222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111202222021 is an equidigital number, since it uses as much as digits as its factorization.

1111202222021 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 17.

Adding to 1111202222021 its reverse (1202222021111), we get a palindrome (2313424243132).

It can be divided in two parts, 111 and 1202222021, that multiplied together give a palindrome (133446644331).

The spelling of 1111202222021 in words is "one trillion, one hundred eleven billion, two hundred two million, two hundred twenty-two thousand, twenty-one".