861021007 has 16 divisors (see below), whose sum is σ = 1075680000. Its totient is φ = 669551040.

The previous prime is 861020999. The next prime is 861021017. The reversal of 861021007 is 700120168.

861021007 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 861021007 - 2³ = 861020999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861021017) 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, 27219 + ... + 49627.

It is an arithmetic number, because the mean of its divisors is an integer number (67230000).

Almost surely, 2^861021007 is an apocalyptic number.

861021007 is a deficient number, since it is larger than the sum of its proper divisors (214658993).

861021007 is a wasteful number, since it uses less digits than its factorization.

861021007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22926.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 861021007 is about 29343.1594583814. The cubic root of 861021007 is about 951.3447279529.

The spelling of 861021007 in words is "eight hundred sixty-one million, twenty-one thousand, seven".