868252221 has 12 divisors (see below), whose sum is σ = 1254401148. Its totient is φ = 578715264.

The previous prime is 868252213. The next prime is 868252243. The reversal of 868252221 is 122252868.

It can be written as a sum of positive squares in 2 ways, for example, as 383768100 + 484484121 = 19590^2 + 22011^2 .

It is not a de Polignac number, because 868252221 - 2³ = 868252213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868252211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68821 + ... + 80453.

It is an arithmetic number, because the mean of its divisors is an integer number (104533429).

Almost surely, 2^868252221 is an apocalyptic number.

It is an amenable number.

868252221 is a deficient number, since it is larger than the sum of its proper divisors (386148927).

868252221 is a wasteful number, since it uses less digits than its factorization.

868252221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19932 (or 19929 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 868252221 is about 29466.1198836901. The cubic root of 868252221 is about 954.0005702566. Note that the first 3 decimals are identical.

The spelling of 868252221 in words is "eight hundred sixty-eight million, two hundred fifty-two thousand, two hundred twenty-one".