862820121 has 8 divisors (see below), whose sum is σ = 1158703840. Its totient is φ = 571074912.

The previous prime is 862820107. The next prime is 862820143. The reversal of 862820121 is 121028268.

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

It is not a de Polignac number, because 862820121 - 2⁹ = 862819609 is a prime.

It is a super-2 number, since 2×862820121² = 1488917122404909282, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (862820221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1034140 + ... + 1034973.

It is an arithmetic number, because the mean of its divisors is an integer number (144837980).

Almost surely, 2^862820121 is an apocalyptic number.

It is an amenable number.

862820121 is a deficient number, since it is larger than the sum of its proper divisors (295883719).

862820121 is a wasteful number, since it uses less digits than its factorization.

862820121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2069255.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 862820121 is about 29373.7999074005. The cubic root of 862820121 is about 952.0068824827.

Adding to 862820121 its reverse (121028268), we get a palindrome (983848389).

The spelling of 862820121 in words is "eight hundred sixty-two million, eight hundred twenty thousand, one hundred twenty-one".