84698772121 has 16 divisors (see below), whose sum is σ = 91300616208. Its totient is φ = 78281164800.

The previous prime is 84698772091. The next prime is 84698772143. The reversal of 84698772121 is 12127789648.

It can be written as a sum of positive squares in 8 ways, for example, as 1573232896 + 83125539225 = 39664^2 + 288315^2 .

It is not a de Polignac number, because 84698772121 - 2¹¹ = 84698770073 is a prime.

It is a super-3 number, since 3×84698772121³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84698772421) 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, 569061 + ... + 702301.

It is an arithmetic number, because the mean of its divisors is an integer number (5706288513).

Almost surely, 2^84698772121 is an apocalyptic number.

It is an amenable number.

84698772121 is a deficient number, since it is larger than the sum of its proper divisors (6601844087).

84698772121 is a wasteful number, since it uses less digits than its factorization.

84698772121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133932.

The product of its digits is 2709504, while the sum is 55.

The spelling of 84698772121 in words is "eighty-four billion, six hundred ninety-eight million, seven hundred seventy-two thousand, one hundred twenty-one".