70251321 has 32 divisors (see below), whose sum is σ = 109778688. Its totient is φ = 39133440.

The previous prime is 70251317. The next prime is 70251343. The reversal of 70251321 is 12315207.

It is not a de Polignac number, because 70251321 - 2² = 70251317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (70251371) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 221455 + ... + 221771.

It is an arithmetic number, because the mean of its divisors is an integer number (3430584).

Almost surely, 2^70251321 is an apocalyptic number.

It is an amenable number.

70251321 is a deficient number, since it is larger than the sum of its proper divisors (39527367).

70251321 is a wasteful number, since it uses less digits than its factorization.

70251321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 70251321 is about 8381.6061110028. The cubic root of 70251321 is about 412.6211625712.

Adding to 70251321 its reverse (12315207), we get a palindrome (82566528).

The spelling of 70251321 in words is "seventy million, two hundred fifty-one thousand, three hundred twenty-one".