5251021121 has 4 divisors (see below), whose sum is σ = 5292367872. Its totient is φ = 5209674372.

The previous prime is 5251021109. The next prime is 5251021157. The reversal of 5251021121 is 1211201525.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5251021121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5251021093 and 5251021102.

It is not an unprimeable number, because it can be changed into a prime (5251021921) 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, 20673185 + ... + 20673438.

It is an arithmetic number, because the mean of its divisors is an integer number (1323091968).

Almost surely, 2^5251021121 is an apocalyptic number.

It is an amenable number.

5251021121 is a deficient number, since it is larger than the sum of its proper divisors (41346751).

5251021121 is a wasteful number, since it uses less digits than its factorization.

5251021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41346750.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 5251021121 is about 72463.9297926907. The cubic root of 5251021121 is about 1738.1259958942.

Adding to 5251021121 its reverse (1211201525), we get a palindrome (6462222646).

The spelling of 5251021121 in words is "five billion, two hundred fifty-one million, twenty-one thousand, one hundred twenty-one".