2221005251 has 8 divisors (see below), whose sum is σ = 2252404800. Its totient is φ = 2189790400.

The previous prime is 2221005221. The next prime is 2221005317. The reversal of 2221005251 is 1525001222.

It is a happy number.

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 2221005251 - 2³⁰ = 1147263427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221005211) 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, 21866 + ... + 70143.

It is an arithmetic number, because the mean of its divisors is an integer number (281550600).

Almost surely, 2^2221005251 is an apocalyptic number.

2221005251 is a deficient number, since it is larger than the sum of its proper divisors (31399549).

2221005251 is a wasteful number, since it uses less digits than its factorization.

2221005251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92349.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 2221005251 is about 47127.5423823479. The cubic root of 2221005251 is about 1304.7176228285.

Adding to 2221005251 its reverse (1525001222), we get a palindrome (3746006473).

The spelling of 2221005251 in words is "two billion, two hundred twenty-one million, five thousand, two hundred fifty-one".