861034021 has 8 divisors (see below), whose sum is σ = 909480704. Its totient is φ = 813879360.

The previous prime is 861033991. The next prime is 861034033. The reversal of 861034021 is 120430168.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 861034021 - 2¹¹ = 861031973 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 (861034061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321636 + ... + 324301.

It is an arithmetic number, because the mean of its divisors is an integer number (113685088).

Almost surely, 2^861034021 is an apocalyptic number.

It is an amenable number.

861034021 is a deficient number, since it is larger than the sum of its proper divisors (48446683).

861034021 is a wasteful number, since it uses less digits than its factorization.

861034021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646011.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 861034021 is about 29343.3812128050. The cubic root of 861034021 is about 951.3495209982.

Adding to 861034021 its reverse (120430168), we get a palindrome (981464189).

The spelling of 861034021 in words is "eight hundred sixty-one million, thirty-four thousand, twenty-one".