84220037891 has 16 divisors (see below), whose sum is σ = 93808435200. Its totient is φ = 75594416040.

The previous prime is 84220037879. The next prime is 84220037939. The reversal of 84220037891 is 19873002248.

It is not a de Polignac number, because 84220037891 - 2¹⁰ = 84220036867 is a prime.

It is a super-2 number, since 2×84220037891² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84220037831) 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, 295331 + ... + 505628.

It is an arithmetic number, because the mean of its divisors is an integer number (5863027200).

Almost surely, 2^84220037891 is an apocalyptic number.

84220037891 is a deficient number, since it is larger than the sum of its proper divisors (9588397309).

84220037891 is an equidigital number, since it uses as much as digits as its factorization.

84220037891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801071 (or 801049 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The spelling of 84220037891 in words is "eighty-four billion, two hundred twenty million, thirty-seven thousand, eight hundred ninety-one".