991222220202 has 32 divisors (see below), whose sum is σ = 1992134124288. Its totient is φ = 328796023296.

The previous prime is 991222220201. The next prime is 991222220207. The reversal of 991222220202 is 202022222199.

It is not an unprimeable number, because it can be changed into a prime (991222220201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 668623 + ... + 1558685.

It is an arithmetic number, because the mean of its divisors is an integer number (62254191384).

Almost surely, 2^991222220202 is an apocalyptic number.

991222220202 is an abundant number, since it is smaller than the sum of its proper divisors (1000911904086).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991222220202 is a wasteful number, since it uses less digits than its factorization.

991222220202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890974.

The product of its (nonzero) digits is 10368, while the sum is 33.

The spelling of 991222220202 in words is "nine hundred ninety-one billion, two hundred twenty-two million, two hundred twenty thousand, two hundred two".