1221001100192 has 48 divisors (see below), whose sum is σ = 2428584840864. Its totient is φ = 604249632000.

The previous prime is 1221001100183. The next prime is 1221001100197. The reversal of 1221001100192 is 2910011001221.

It is not an unprimeable number, because it can be changed into a prime (1221001100197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 722567 + ... + 1721657.

It is an arithmetic number, because the mean of its divisors is an integer number (50595517518).

Almost surely, 2^{1221001100192} is an apocalyptic number.

It is an amenable number.

1221001100192 is a deficient number, since it is larger than the sum of its proper divisors (1207583740672).

1221001100192 is a wasteful number, since it uses less digits than its factorization.

1221001100192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999493 (or 999485 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 1221001100192 in words is "one trillion, two hundred twenty-one billion, one million, one hundred thousand, one hundred ninety-two".