1921051027655 has 16 divisors (see below), whose sum is σ = 2312840079360. Its totient is φ = 1531792961952.

The previous prime is 1921051027627. The next prime is 1921051027663. The reversal of 1921051027655 is 5567201501291.

It is a cyclic number.

It is not a de Polignac number, because 1921051027655 - 2¹⁸ = 1921050765511 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2986226 + ... + 3572064.

It is an arithmetic number, because the mean of its divisors is an integer number (144552504960).

Almost surely, 2^{1921051027655} is an apocalyptic number.

1921051027655 is a deficient number, since it is larger than the sum of its proper divisors (391789051705).

1921051027655 is a wasteful number, since it uses less digits than its factorization.

1921051027655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587998.

The product of its (nonzero) digits is 189000, while the sum is 44.

The spelling of 1921051027655 in words is "one trillion, nine hundred twenty-one billion, fifty-one million, twenty-seven thousand, six hundred fifty-five".