84842774620221 has 4 divisors (see below), whose sum is σ = 113123699493632. Its totient is φ = 56561849746812.

The previous prime is 84842774620211. The next prime is 84842774620277. The reversal of 84842774620221 is 12202647724848.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 84842774620221 - 2¹⁸ = 84842774358077 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 (84842774620211) 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, 14140462436701 + ... + 14140462436706.

It is an arithmetic number, because the mean of its divisors is an integer number (28280924873408).

Almost surely, 2^{84842774620221} is an apocalyptic number.

It is an amenable number.

84842774620221 is a deficient number, since it is larger than the sum of its proper divisors (28280924873411).

84842774620221 is a wasteful number, since it uses less digits than its factorization.

84842774620221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28280924873410.

The product of its (nonzero) digits is 19267584, while the sum is 57.

The spelling of 84842774620221 in words is "eighty-four trillion, eight hundred forty-two billion, seven hundred seventy-four million, six hundred twenty thousand, two hundred twenty-one".