2120064217849 has 2 divisors, whose sum is σ = 2120064217850. Its totient is φ = 2120064217848.

The previous prime is 2120064217823. The next prime is 2120064217861. The reversal of 2120064217849 is 9487124600212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1547802227449 + 572261990400 = 1244107^2 + 756480^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120064217849 - 2⁷ = 2120064217721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2120064217799 and 2120064217808.

It is not a weakly prime, because it can be changed into another prime (2120064217879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060032108924 + 1060032108925.

It is an arithmetic number, because the mean of its divisors is an integer number (1060032108925).

Almost surely, 2^{2120064217849} is an apocalyptic number.

It is an amenable number.

2120064217849 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120064217849 is an equidigital number, since it uses as much as digits as its factorization.

2120064217849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 2120064217849 in words is "two trillion, one hundred twenty billion, sixty-four million, two hundred seventeen thousand, eight hundred forty-nine".