83121146621821 has 32 divisors (see below), whose sum is σ = 104772505522176. Its totient is φ = 64058041320000.

The previous prime is 83121146621797. The next prime is 83121146621827. The reversal of 83121146621821 is 12812664112138.

It is not a de Polignac number, because 83121146621821 - 2¹⁵ = 83121146589053 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 (83121146621827) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1218726 + ... + 12950968.

It is an arithmetic number, because the mean of its divisors is an integer number (3274140797568).

Almost surely, 2^{83121146621821} is an apocalyptic number.

It is an amenable number.

83121146621821 is a deficient number, since it is larger than the sum of its proper divisors (21651358900355).

83121146621821 is a wasteful number, since it uses less digits than its factorization.

83121146621821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11733273.

The product of its digits is 221184, while the sum is 46.

The spelling of 83121146621821 in words is "eighty-three trillion, one hundred twenty-one billion, one hundred forty-six million, six hundred twenty-one thousand, eight hundred twenty-one".