2155145211 has 10 divisors (see below), whose sum is σ = 3219414572. Its totient is φ = 1436763420.

The previous prime is 2155145183. The next prime is 2155145261. The reversal of 2155145211 is 1125415512.

It is a happy number.

It is not a de Polignac number, because 2155145211 - 2⁹ = 2155144699 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155145261) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 13303285 + ... + 13303446.

Almost surely, 2^2155145211 is an apocalyptic number.

2155145211 is a deficient number, since it is larger than the sum of its proper divisors (1064269361).

2155145211 is an equidigital number, since it uses as much as digits as its factorization.

2155145211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26606743 (or 26606734 counting only the distinct ones).

The product of its digits is 2000, while the sum is 27.

The square root of 2155145211 is about 46423.5415602903. The cubic root of 2155145211 is about 1291.6916314527.

The spelling of 2155145211 in words is "two billion, one hundred fifty-five million, one hundred forty-five thousand, two hundred eleven".