70707021 has 16 divisors (see below), whose sum is σ = 117539328. Its totient is φ = 36730800.

The previous prime is 70707019. The next prime is 70707023. The reversal of 70707021 is 12070707.

It is an interprime number because it is at equal distance from previous prime (70707019) and next prime (70707023).

It is not a de Polignac number, because 70707021 - 2¹ = 70707019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 70706982 and 70707000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70707023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152815 + ... + 153276.

It is an arithmetic number, because the mean of its divisors is an integer number (7346208).

Almost surely, 2^70707021 is an apocalyptic number.

It is an amenable number.

70707021 is a deficient number, since it is larger than the sum of its proper divisors (46832307).

70707021 is a wasteful number, since it uses less digits than its factorization.

70707021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306112.

The product of its (nonzero) digits is 686, while the sum is 24.

The square root of 70707021 is about 8408.7466961492. The cubic root of 70707021 is about 413.5114250906.

Adding to 70707021 its reverse (12070707), we get a palindrome (82777728).

The spelling of 70707021 in words is "seventy million, seven hundred seven thousand, twenty-one".