612216163021 has 2 divisors, whose sum is σ = 612216163022. Its totient is φ = 612216163020.

The previous prime is 612216163003. The next prime is 612216163087. The reversal of 612216163021 is 120361612216.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 353352969225 + 258863193796 = 594435^2 + 508786^2 .

It is a cyclic number.

It is not a de Polignac number, because 612216163021 - 2³⁵ = 577856424653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (612216163421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306108081510 + 306108081511.

It is an arithmetic number, because the mean of its divisors is an integer number (306108081511).

Almost surely, 2^612216163021 is an apocalyptic number.

It is an amenable number.

612216163021 is a deficient number, since it is larger than the sum of its proper divisors (1).

612216163021 is an equidigital number, since it uses as much as digits as its factorization.

612216163021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

Adding to 612216163021 its reverse (120361612216), we get a palindrome (732577775237).

The spelling of 612216163021 in words is "six hundred twelve billion, two hundred sixteen million, one hundred sixty-three thousand, twenty-one".