991210120022 has 4 divisors (see below), whose sum is σ = 1486815180036. Its totient is φ = 495605060010.

The previous prime is 991210120013. The next prime is 991210120027. The reversal of 991210120022 is 220021012199.

991210120022 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 220021012199 = 3251 ⋅67677949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991210120027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247802530004 + ... + 247802530007.

It is an arithmetic number, because the mean of its divisors is an integer number (371703795009).

Almost surely, 2^991210120022 is an apocalyptic number.

991210120022 is a deficient number, since it is larger than the sum of its proper divisors (495605060014).

991210120022 is a wasteful number, since it uses less digits than its factorization.

991210120022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495605060013.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 991210120022 in words is "nine hundred ninety-one billion, two hundred ten million, one hundred twenty thousand, twenty-two".