70707921 has 4 divisors (see below), whose sum is σ = 94277232. Its totient is φ = 47138612.

The previous prime is 70707907. The next prime is 70707937. The reversal of 70707921 is 12970707.

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: 12970707 = 3 ⋅4323569.

It is a cyclic number.

It is not a de Polignac number, because 70707921 - 2²¹ = 68610769 is a prime.

It is a super-2 number, since 2×70707921² = 9999220184284482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (70707941) 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, 11784651 + ... + 11784656.

It is an arithmetic number, because the mean of its divisors is an integer number (23569308).

Almost surely, 2^70707921 is an apocalyptic number.

It is an amenable number.

70707921 is a deficient number, since it is larger than the sum of its proper divisors (23569311).

70707921 is a wasteful number, since it uses less digits than its factorization.

70707921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23569310.

The product of its (nonzero) digits is 6174, while the sum is 33.

The square root of 70707921 is about 8408.8002116830. The cubic root of 70707921 is about 413.5131795543.

The spelling of 70707921 in words is "seventy million, seven hundred seven thousand, nine hundred twenty-one".