1221000020192 has 24 divisors (see below), whose sum is σ = 2419976979000. Its totient is φ = 606402692224.

The previous prime is 1221000020189. The next prime is 1221000020209. The reversal of 1221000020192 is 2910200001221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128036342 + ... + 128045877.

It is an arithmetic number, because the mean of its divisors is an integer number (100832374125).

Almost surely, 2^{1221000020192} is an apocalyptic number.

It is an amenable number.

1221000020192 is a deficient number, since it is larger than the sum of its proper divisors (1198976958808).

1221000020192 is a wasteful number, since it uses less digits than its factorization.

1221000020192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256082378 (or 256082370 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 1221000020192 in words is "one trillion, two hundred twenty-one billion, twenty thousand, one hundred ninety-two".