7800881221 has 16 divisors (see below), whose sum is σ = 9103957504. Its totient is φ = 6546198384.

The previous prime is 7800881203. The next prime is 7800881287. The reversal of 7800881221 is 1221880087.

It is a cyclic number.

It is not a de Polignac number, because 7800881221 - 2⁹ = 7800880709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7800881021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25426 + ... + 127468.

It is an arithmetic number, because the mean of its divisors is an integer number (568997344).

Almost surely, 2^7800881221 is an apocalyptic number.

It is an amenable number.

7800881221 is a deficient number, since it is larger than the sum of its proper divisors (1303076283).

7800881221 is a wasteful number, since it uses less digits than its factorization.

7800881221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102280.

The product of its (nonzero) digits is 14336, while the sum is 37.

The square root of 7800881221 is about 88322.5974538793. The cubic root of 7800881221 is about 1983.2671649480.

The spelling of 7800881221 in words is "seven billion, eight hundred million, eight hundred eighty-one thousand, two hundred twenty-one".