869440221 has 24 divisors (see below), whose sum is σ = 1354689336. Its totient is φ = 534159360.

The previous prime is 869440183. The next prime is 869440261. The reversal of 869440221 is 122044968.

It can be written as a sum of positive squares in 4 ways, for example, as 371525625 + 497914596 = 19275^2 + 22314^2 .

It is not a de Polignac number, because 869440221 - 2²⁶ = 802331357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (869440261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69201 + ... + 80793.

It is an arithmetic number, because the mean of its divisors is an integer number (56445389).

Almost surely, 2^869440221 is an apocalyptic number.

It is an amenable number.

869440221 is a deficient number, since it is larger than the sum of its proper divisors (485249115).

869440221 is a wasteful number, since it uses less digits than its factorization.

869440221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12253 (or 12250 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 869440221 is about 29486.2717378783. The cubic root of 869440221 is about 954.4354808096.

The spelling of 869440221 in words is "eight hundred sixty-nine million, four hundred forty thousand, two hundred twenty-one".