2155213051 has 8 divisors (see below), whose sum is σ = 2174859504. Its totient is φ = 2135654400.

The previous prime is 2155213013. The next prime is 2155213057. The reversal of 2155213051 is 1503125512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2155213051 - 2¹⁵ = 2155180283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155213057) 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 in 7 ways as a sum of consecutive naturals, for example, 27876 + ... + 71326.

It is an arithmetic number, because the mean of its divisors is an integer number (271857438).

Almost surely, 2^2155213051 is an apocalyptic number.

2155213051 is a deficient number, since it is larger than the sum of its proper divisors (19646453).

2155213051 is a wasteful number, since it uses less digits than its factorization.

2155213051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43901.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 2155213051 is about 46424.2722183127. The cubic root of 2155213051 is about 1291.7051846680.

Adding to 2155213051 its reverse (1503125512), we get a palindrome (3658338563).

The spelling of 2155213051 in words is "two billion, one hundred fifty-five million, two hundred thirteen thousand, fifty-one".