2067757221821 has 2 divisors, whose sum is σ = 2067757221822. Its totient is φ = 2067757221820.

The previous prime is 2067757221709. The next prime is 2067757221833. The reversal of 2067757221821 is 1281227577602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1307102877796 + 760654344025 = 1143286^2 + 872155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2067757221821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2067757221821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2067757220821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1033878610910 + 1033878610911.

It is an arithmetic number, because the mean of its divisors is an integer number (1033878610911).

Almost surely, 2^{2067757221821} is an apocalyptic number.

It is an amenable number.

2067757221821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2067757221821 is an equidigital number, since it uses as much as digits as its factorization.

2067757221821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1317120, while the sum is 50.

The spelling of 2067757221821 in words is "two trillion, sixty-seven billion, seven hundred fifty-seven million, two hundred twenty-one thousand, eight hundred twenty-one".