2129198251 has 4 divisors (see below), whose sum is σ = 2221772112. Its totient is φ = 2036624392.

The previous prime is 2129198233. The next prime is 2129198287. The reversal of 2129198251 is 1528919212.

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 2129198251 - 2¹³ = 2129190059 is a prime.

It is a super-2 number, since 2×2129198251² = 9066970384122918002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2129198221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46286896 + ... + 46286941.

It is an arithmetic number, because the mean of its divisors is an integer number (555443028).

Almost surely, 2^2129198251 is an apocalyptic number.

2129198251 is a deficient number, since it is larger than the sum of its proper divisors (92573861).

2129198251 is an equidigital number, since it uses as much as digits as its factorization.

2129198251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92573860.

The product of its digits is 25920, while the sum is 40.

The square root of 2129198251 is about 46143.2362432459. The cubic root of 2129198251 is about 1286.4868960616.

The spelling of 2129198251 in words is "two billion, one hundred twenty-nine million, one hundred ninety-eight thousand, two hundred fifty-one".