70221312 has 180 divisors, whose sum is σ = 236509416. Its totient is φ = 19998720.

The previous prime is 70221311. The next prime is 70221331. The reversal of 70221312 is 21312207.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70221311) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 225637 + ... + 225947.

Almost surely, 2^70221312 is an apocalyptic number.

70221312 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70221312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118254708).

70221312 is an abundant number, since it is smaller than the sum of its proper divisors (166288104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

70221312 is a wasteful number, since it uses less digits than its factorization.

70221312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 70221312 is about 8379.8157497644. The cubic root of 70221312 is about 412.5624015789.

Adding to 70221312 its reverse (21312207), we get a palindrome (91533519).

The spelling of 70221312 in words is "seventy million, two hundred twenty-one thousand, three hundred twelve".