2106356251 has 4 divisors (see below), whose sum is σ = 2137794472. Its totient is φ = 2074918032.

The previous prime is 2106356249. The next prime is 2106356257. The reversal of 2106356251 is 1526536012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2106356251 - 2¹ = 2106356249 is a prime.

It is a super-2 number, since 2×2106356251² = 8873473312253550002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2106356257) 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 3 ways as a sum of consecutive naturals, for example, 15719010 + ... + 15719143.

It is an arithmetic number, because the mean of its divisors is an integer number (534448618).

Almost surely, 2^2106356251 is an apocalyptic number.

2106356251 is a deficient number, since it is larger than the sum of its proper divisors (31438221).

2106356251 is an equidigital number, since it uses as much as digits as its factorization.

2106356251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31438220.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 2106356251 is about 45895.0569342713. The cubic root of 2106356251 is about 1281.8698767367.

The spelling of 2106356251 in words is "two billion, one hundred six million, three hundred fifty-six thousand, two hundred fifty-one".