2164313533621 has 2 divisors, whose sum is σ = 2164313533622. Its totient is φ = 2164313533620.

The previous prime is 2164313533573. The next prime is 2164313533643. The reversal of 2164313533621 is 1263353134612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1600591871025 + 563721662596 = 1265145^2 + 750814^2 .

It is a cyclic number.

It is not a de Polignac number, because 2164313533621 - 2¹⁷ = 2164313402549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2164313533661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082156766810 + 1082156766811.

It is an arithmetic number, because the mean of its divisors is an integer number (1082156766811).

Almost surely, 2^{2164313533621} is an apocalyptic number.

It is an amenable number.

2164313533621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2164313533621 is an equidigital number, since it uses as much as digits as its factorization.

2164313533621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 40.

The spelling of 2164313533621 in words is "two trillion, one hundred sixty-four billion, three hundred thirteen million, five hundred thirty-three thousand, six hundred twenty-one".