91101020212 has 24 divisors (see below), whose sum is σ = 160469279432. Its totient is φ = 45253555200.

The previous prime is 91101020201. The next prime is 91101020233. The reversal of 91101020212 is 21202010119.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3482652196 + 87618368016 = 59014^2 + 296004^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 91101020212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293608 + ... + 518080.

Almost surely, 2^91101020212 is an apocalyptic number.

It is an amenable number.

91101020212 is a deficient number, since it is larger than the sum of its proper divisors (69368259220).

91101020212 is a wasteful number, since it uses less digits than its factorization.

91101020212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225139 (or 225137 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 91101020212 in words is "ninety-one billion, one hundred one million, twenty thousand, two hundred twelve".