97036206821 has 4 divisors (see below), whose sum is σ = 97077032172. Its totient is φ = 96995381472.

The previous prime is 97036206803. The next prime is 97036206833. The reversal of 97036206821 is 12860263079.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12860263079 = 23 ⋅559141873.

It can be written as a sum of positive squares in 2 ways, for example, as 23695984225 + 73340222596 = 153935^2 + 270814^2 .

It is a cyclic number.

It is not a de Polignac number, because 97036206821 - 2²⁶ = 96969097957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97036206881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20409110 + ... + 20413863.

It is an arithmetic number, because the mean of its divisors is an integer number (24269258043).

Almost surely, 2^97036206821 is an apocalyptic number.

It is an amenable number.

97036206821 is a deficient number, since it is larger than the sum of its proper divisors (40825351).

97036206821 is a wasteful number, since it uses less digits than its factorization.

97036206821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40825350.

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 97036206821 in words is "ninety-seven billion, thirty-six million, two hundred six thousand, eight hundred twenty-one".