1122420821 has 2 divisors, whose sum is σ = 1122420822. Its totient is φ = 1122420820.

The previous prime is 1122420809. The next prime is 1122420823. The reversal of 1122420821 is 1280242211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 808776721 + 313644100 = 28439^2 + 17710^2 .

It is a cyclic number.

It is not a de Polignac number, because 1122420821 - 2⁶ = 1122420757 is a prime.

Together with 1122420823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1122420823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561210410 + 561210411.

It is an arithmetic number, because the mean of its divisors is an integer number (561210411).

Almost surely, 2^1122420821 is an apocalyptic number.

It is an amenable number.

1122420821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1122420821 is an equidigital number, since it uses as much as digits as its factorization.

1122420821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 1122420821 is about 33502.5494701523. The cubic root of 1122420821 is about 1039.2465021017.

The spelling of 1122420821 in words is "one billion, one hundred twenty-two million, four hundred twenty thousand, eight hundred twenty-one".