1070707721 has 4 divisors (see below), whose sum is σ = 1074658944. Its totient is φ = 1066756500.

The previous prime is 1070707709. The next prime is 1070707723. The reversal of 1070707721 is 1277070701.

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 not a de Polignac number, because 1070707721 - 2¹⁰ = 1070706697 is a prime.

It is a super-2 number, since 2×1070707721² = 2292830047618027682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1070707723) 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, 1975205 + ... + 1975746.

It is an arithmetic number, because the mean of its divisors is an integer number (268664736).

Almost surely, 2^1070707721 is an apocalyptic number.

It is an amenable number.

1070707721 is a deficient number, since it is larger than the sum of its proper divisors (3951223).

1070707721 is an equidigital number, since it uses as much as digits as its factorization.

1070707721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3951222.

The product of its (nonzero) digits is 4802, while the sum is 32.

The square root of 1070707721 is about 32721.6705105348. The cubic root of 1070707721 is about 1023.0345747168.

The spelling of 1070707721 in words is "one billion, seventy million, seven hundred seven thousand, seven hundred twenty-one".