70152221 has 4 divisors (see below), whose sum is σ = 71783712. Its totient is φ = 68520732.

The previous prime is 70152179. The next prime is 70152223. The reversal of 70152221 is 12225107.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70152221 is a prime.

It is a super-2 number, since 2×70152221² = 9842668222465682, which contains 22 as substring.

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 = 70152193 and 70152202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70152223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 815681 + ... + 815766.

It is an arithmetic number, because the mean of its divisors is an integer number (17945928).

Almost surely, 2^70152221 is an apocalyptic number.

It is an amenable number.

70152221 is a deficient number, since it is larger than the sum of its proper divisors (1631491).

70152221 is a wasteful number, since it uses less digits than its factorization.

70152221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631490.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 70152221 is about 8375.6922698963. The cubic root of 70152221 is about 412.4270499708.

Adding to 70152221 its reverse (12225107), we get a palindrome (82377328).

The spelling of 70152221 in words is "seventy million, one hundred fifty-two thousand, two hundred twenty-one".