70171021 has 4 divisors (see below), whose sum is σ = 70287232. Its totient is φ = 70054812.

The previous prime is 70170983. The next prime is 70171027. The reversal of 70171021 is 12017107.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12017107 = 29 ⋅414383.

It is a cyclic number.

It is not a de Polignac number, because 70171021 - 2²¹ = 68073869 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 70171021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70171027) 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, 57195 + ... + 58408.

It is an arithmetic number, because the mean of its divisors is an integer number (17571808).

Almost surely, 2^70171021 is an apocalyptic number.

It is an amenable number.

70171021 is a deficient number, since it is larger than the sum of its proper divisors (116211).

70171021 is a wasteful number, since it uses less digits than its factorization.

70171021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116210.

The product of its (nonzero) digits is 98, while the sum is 19.

The square root of 70171021 is about 8376.8144900075. The cubic root of 70171021 is about 412.4638886049.

Adding to 70171021 its reverse (12017107), we get a palindrome (82188128).

The spelling of 70171021 in words is "seventy million, one hundred seventy-one thousand, twenty-one".