91820000212 has 12 divisors (see below), whose sum is σ = 160689080916. Its totient is φ = 45908834240.

The previous prime is 91820000203. The next prime is 91820000227. The reversal of 91820000212 is 21200002819.

It can be written as a sum of positive squares in 2 ways, for example, as 39345102736 + 52474897476 = 198356^2 + 229074^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100339 + ... + 440122.

It is an arithmetic number, because the mean of its divisors is an integer number (13390756743).

Almost surely, 2^91820000212 is an apocalyptic number.

It is an amenable number.

91820000212 is a deficient number, since it is larger than the sum of its proper divisors (68869080704).

91820000212 is a wasteful number, since it uses less digits than its factorization.

91820000212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582938 (or 582936 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 91820000212 in words is "ninety-one billion, eight hundred twenty million, two hundred twelve", and thus it is an aban number.