810020612121 has 8 divisors (see below), whose sum is σ = 1234317123264. Its totient is φ = 462868921200.

The previous prime is 810020612119. The next prime is 810020612131. The reversal of 810020612121 is 121216020018.

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

It is not a de Polignac number, because 810020612121 - 2¹ = 810020612119 is a prime.

It is a super-2 number, since 2×810020612121² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 810020612091 and 810020612100.

It is not an unprimeable number, because it can be changed into a prime (810020612131) 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, 19286205030 + ... + 19286205071.

It is an arithmetic number, because the mean of its divisors is an integer number (154289640408).

Almost surely, 2^810020612121 is an apocalyptic number.

It is an amenable number.

810020612121 is a deficient number, since it is larger than the sum of its proper divisors (424296511143).

810020612121 is a wasteful number, since it uses less digits than its factorization.

810020612121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38572410111.

The product of its (nonzero) digits is 384, while the sum is 24.

Adding to 810020612121 its reverse (121216020018), we get a palindrome (931236632139).

It can be divided in two parts, 810020 and 612121, that added together give a triangular number (1422141 = T₁₆₈₆).

The spelling of 810020612121 in words is "eight hundred ten billion, twenty million, six hundred twelve thousand, one hundred twenty-one".