70535021 has 4 divisors (see below), whose sum is σ = 71528544. Its totient is φ = 69541500.

The previous prime is 70534993. The next prime is 70535033. The reversal of 70535021 is 12053507.

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-70535021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75535021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 496655 + ... + 496796.

It is an arithmetic number, because the mean of its divisors is an integer number (17882136).

Almost surely, 2^70535021 is an apocalyptic number.

70535021 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

70535021 is a deficient number, since it is larger than the sum of its proper divisors (993523).

70535021 is an equidigital number, since it uses as much as digits as its factorization.

70535021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993522.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 70535021 is about 8398.5130231488. The cubic root of 70535021 is about 413.1758539144.

Adding to 70535021 its reverse (12053507), we get a palindrome (82588528).

The spelling of 70535021 in words is "seventy million, five hundred thirty-five thousand, twenty-one".