7800221111 has 8 divisors (see below), whose sum is σ = 7838932800. Its totient is φ = 7761585888.

The previous prime is 7800221053. The next prime is 7800221131. The reversal of 7800221111 is 1111220087.

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-7800221111 is a prime.

It is a super-4 number, since 4×7800221111⁴ (a number of 41 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7800221131) 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, 191090 + ... + 228288.

It is an arithmetic number, because the mean of its divisors is an integer number (979866600).

Almost surely, 2^7800221111 is an apocalyptic number.

7800221111 is a deficient number, since it is larger than the sum of its proper divisors (38711689).

7800221111 is a wasteful number, since it uses less digits than its factorization.

7800221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38233.

The product of its (nonzero) digits is 224, while the sum is 23.

The square root of 7800221111 is about 88318.8604489437. The cubic root of 7800221111 is about 1983.2112220624.

Adding to 7800221111 its reverse (1111220087), we get a palindrome (8911441198).

The spelling of 7800221111 in words is "seven billion, eight hundred million, two hundred twenty-one thousand, one hundred eleven".