86472779852021 has 2 divisors, whose sum is σ = 86472779852022. Its totient is φ = 86472779852020.

The previous prime is 86472779852009. The next prime is 86472779852023. The reversal of 86472779852021 is 12025897727468.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65602629207025 + 20870150644996 = 8099545^2 + 4568386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86472779852021 is a prime.

Together with 86472779852023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86472779852023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43236389926010 + 43236389926011.

It is an arithmetic number, because the mean of its divisors is an integer number (43236389926011).

Almost surely, 2^{86472779852021} is an apocalyptic number.

It is an amenable number.

86472779852021 is a deficient number, since it is larger than the sum of its proper divisors (1).

86472779852021 is an equidigital number, since it uses as much as digits as its factorization.

86472779852021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 189665280, while the sum is 68.

The spelling of 86472779852021 in words is "eighty-six trillion, four hundred seventy-two billion, seven hundred seventy-nine million, eight hundred fifty-two thousand, twenty-one".