97812021879 has 32 divisors (see below), whose sum is σ = 170240044800. Its totient is φ = 54720010080.

The previous prime is 97812021821. The next prime is 97812021893.

97812021879 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 97812021879 - 2⁷ = 97812021751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97812021379) 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 31 ways as a sum of consecutive naturals, for example, 12662809 + ... + 12670530.

It is an arithmetic number, because the mean of its divisors is an integer number (5320001400).

Almost surely, 2^97812021879 is an apocalyptic number.

97812021879 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

97812021879 is a deficient number, since it is larger than the sum of its proper divisors (72428022921).

97812021879 is a wasteful number, since it uses less digits than its factorization.

97812021879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25333372 (or 25333366 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 54.

It can be divided in two parts, 978120 and 21879, that added together give a palindrome (999999).

The spelling of 97812021879 in words is "ninety-seven billion, eight hundred twelve million, twenty-one thousand, eight hundred seventy-nine".