91214221216 has 12 divisors (see below), whose sum is σ = 179577998082. Its totient is φ = 45607110592.

The previous prime is 91214221183. The next prime is 91214221247. The reversal of 91214221216 is 61212241219.

It can be written as a sum of positive squares in only one way, i.e., 90829904400 + 384316816 = 301380^2 + 19604^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1425222175 + ... + 1425222238.

Almost surely, 2^91214221216 is an apocalyptic number.

It is an amenable number.

91214221216 is a deficient number, since it is larger than the sum of its proper divisors (88363776866).

91214221216 is a wasteful number, since it uses less digits than its factorization.

91214221216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2850444423 (or 2850444415 counting only the distinct ones).

The product of its digits is 3456, while the sum is 31.

The spelling of 91214221216 in words is "ninety-one billion, two hundred fourteen million, two hundred twenty-one thousand, two hundred sixteen".