2921939390869 has 2 divisors, whose sum is σ = 2921939390870. Its totient is φ = 2921939390868.

The previous prime is 2921939390857. The next prime is 2921939390891. The reversal of 2921939390869 is 9680939391292.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1947894748900 + 974044641969 = 1395670^2 + 986937^2 .

It is a cyclic number.

It is not a de Polignac number, because 2921939390869 - 2¹⁵ = 2921939358101 is a prime.

It is a super-2 number, since 2×2921939390869² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2921939390798 and 2921939390807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2921939390969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1460969695434 + 1460969695435.

It is an arithmetic number, because the mean of its divisors is an integer number (1460969695435).

Almost surely, 2^{2921939390869} is an apocalyptic number.

It is an amenable number.

2921939390869 is a deficient number, since it is larger than the sum of its proper divisors (1).

2921939390869 is an equidigital number, since it uses as much as digits as its factorization.

2921939390869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102036672, while the sum is 70.

The spelling of 2921939390869 in words is "two trillion, nine hundred twenty-one billion, nine hundred thirty-nine million, three hundred ninety thousand, eight hundred sixty-nine".