611440442021 has 2 divisors, whose sum is σ = 611440442022. Its totient is φ = 611440442020.

The previous prime is 611440442003. The next prime is 611440442023. The reversal of 611440442021 is 120244044116.

611440442021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 611289422500 + 151019521 = 781850^2 + 12289^2 .

It is a cyclic number.

It is not a de Polignac number, because 611440442021 - 2¹⁸ = 611440179877 is a prime.

Together with 611440442023, 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 (611440442023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305720221010 + 305720221011.

It is an arithmetic number, because the mean of its divisors is an integer number (305720221011).

Almost surely, 2^611440442021 is an apocalyptic number.

It is an amenable number.

611440442021 is a deficient number, since it is larger than the sum of its proper divisors (1).

611440442021 is an equidigital number, since it uses as much as digits as its factorization.

611440442021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 29.

Adding to 611440442021 its reverse (120244044116), we get a palindrome (731684486137).

The spelling of 611440442021 in words is "six hundred eleven billion, four hundred forty million, four hundred forty-two thousand, twenty-one".