91211212102 has 16 divisors (see below), whose sum is σ = 142976303712. Its totient is φ = 43558303360.

The previous prime is 91211212091. The next prime is 91211212117. The reversal of 91211212102 is 20121211219.

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, 1433299 + ... + 1495582.

It is an arithmetic number, because the mean of its divisors is an integer number (8936018982).

Almost surely, 2^91211212102 is an apocalyptic number.

91211212102 is a deficient number, since it is larger than the sum of its proper divisors (51765091610).

91211212102 is a wasteful number, since it uses less digits than its factorization.

91211212102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2929583.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 91211212102 in words is "ninety-one billion, two hundred eleven million, two hundred twelve thousand, one hundred two".