1221892228155 has 16 divisors (see below), whose sum is σ = 1957932525600. Its totient is φ = 650707534848.

The previous prime is 1221892228121. The next prime is 1221892228181. The reversal of 1221892228155 is 5518222981221.

It is not a de Polignac number, because 1221892228155 - 2⁹ = 1221892227643 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60509580 + ... + 60529769.

It is an arithmetic number, because the mean of its divisors is an integer number (122370782850).

Almost surely, 2^{1221892228155} is an apocalyptic number.

1221892228155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1221892228155 is a deficient number, since it is larger than the sum of its proper divisors (736040297445).

1221892228155 is a wasteful number, since it uses less digits than its factorization.

1221892228155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121040030.

The product of its digits is 460800, while the sum is 48.

The spelling of 1221892228155 in words is "one trillion, two hundred twenty-one billion, eight hundred ninety-two million, two hundred twenty-eight thousand, one hundred fifty-five".