2156520211 has 2 divisors, whose sum is σ = 2156520212. Its totient is φ = 2156520210.

The previous prime is 2156520143. The next prime is 2156520271. The reversal of 2156520211 is 1120256512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2156520211 - 2⁹ = 2156519699 is a prime.

It is not a weakly prime, because it can be changed into another prime (2156520271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078260105 + 1078260106.

It is an arithmetic number, because the mean of its divisors is an integer number (1078260106).

Almost surely, 2^2156520211 is an apocalyptic number.

2156520211 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156520211 is an equidigital number, since it uses as much as digits as its factorization.

2156520211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 2156520211 is about 46438.3484956130. The cubic root of 2156520211 is about 1291.9662762734.

Adding to 2156520211 its reverse (1120256512), we get a palindrome (3276776723).

The spelling of 2156520211 in words is "two billion, one hundred fifty-six million, five hundred twenty thousand, two hundred eleven".