1101788214921 has 45 divisors (see below), whose sum is σ = 1656462110589. Its totient is φ = 729833491944.

The previous prime is 1101788214883. The next prime is 1101788214971. The reversal of 1101788214921 is 1294128871011.

The square root of 1101788214921 is 1049661.

It is a perfect power (a square), and thus also a powerful number.

1101788214921 is a `hidden beast` number, since 1 + 10 + 1 + 78 + 82 + 1 + 492 + 1 = 666.

It is not a de Polignac number, because 1101788214921 - 2²³ = 1101779826313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1101788214971) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 2106669366 + ... + 2106669888.

Almost surely, 2^{1101788214921} is an apocalyptic number.

1101788214921 is the 1049661-st square number.

1101788214921 is the 524831-st centered octagonal number.

It is an amenable number.

1101788214921 is a deficient number, since it is larger than the sum of its proper divisors (554673895668).

1101788214921 is an frugal number, since it uses more digits than its factorization.

1101788214921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504 (or 749 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 45.

The spelling of 1101788214921 in words is "one trillion, one hundred one billion, seven hundred eighty-eight million, two hundred fourteen thousand, nine hundred twenty-one".