2155213505 has 16 divisors (see below), whose sum is σ = 2857451904. Its totient is φ = 1552193280.

The previous prime is 2155213499. The next prime is 2155213507. The reversal of 2155213505 is 5053125512.

It is not a de Polignac number, because 2155213505 - 2¹⁰ = 2155212481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155213507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 549251 + ... + 553160.

It is an arithmetic number, because the mean of its divisors is an integer number (178590744).

Almost surely, 2^2155213505 is an apocalyptic number.

It is an amenable number.

2155213505 is a deficient number, since it is larger than the sum of its proper divisors (702238399).

2155213505 is a wasteful number, since it uses less digits than its factorization.

2155213505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102456.

The product of its (nonzero) digits is 7500, while the sum is 29.

The square root of 2155213505 is about 46424.2771079960. The cubic root of 2155213505 is about 1291.7052753681.

The spelling of 2155213505 in words is "two billion, one hundred fifty-five million, two hundred thirteen thousand, five hundred five".