2121351251 has 8 divisors (see below), whose sum is σ = 2183030784. Its totient is φ = 2060361160.

The previous prime is 2121351233. The next prime is 2121351257. The reversal of 2121351251 is 1521531212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121351251 is a prime.

It is a super-2 number, since 2×2121351251² = 9000262260238530002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121351257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166115 + ... + 178428.

It is an arithmetic number, because the mean of its divisors is an integer number (272878848).

Almost surely, 2^2121351251 is an apocalyptic number.

2121351251 is a deficient number, since it is larger than the sum of its proper divisors (61679533).

2121351251 is a wasteful number, since it uses less digits than its factorization.

2121351251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344721.

The product of its digits is 600, while the sum is 23.

The square root of 2121351251 is about 46058.1290436335. The cubic root of 2121351251 is about 1284.9045336779.

Adding to 2121351251 its reverse (1521531212), we get a palindrome (3642882463).

The spelling of 2121351251 in words is "two billion, one hundred twenty-one million, three hundred fifty-one thousand, two hundred fifty-one".