70222221 has 10 divisors (see below), whose sum is σ = 104899982. Its totient is φ = 46814760.

The previous prime is 70222211. The next prime is 70222247. The reversal of 70222221 is 12222207.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 49154121 + 21068100 = 7011^2 + 4590^2 .

It is not a de Polignac number, because 70222221 - 2⁷ = 70222093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 70222194 and 70222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70222211) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 433390 + ... + 433551.

Almost surely, 2^70222221 is an apocalyptic number.

It is an amenable number.

70222221 is a deficient number, since it is larger than the sum of its proper divisors (34677761).

70222221 is an equidigital number, since it uses as much as digits as its factorization.

70222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866953 (or 866944 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 70222221 is about 8379.8699870583. The cubic root of 70222221 is about 412.5641817488.

Adding to 70222221 its reverse (12222207), we get a palindrome (82444428).

The spelling of 70222221 in words is "seventy million, two hundred twenty-two thousand, two hundred twenty-one".