11127929121 has 21 divisors (see below), whose sum is σ = 16688532801. Its totient is φ = 7416720612.

The previous prime is 11127929083. The next prime is 11127929123. The reversal of 11127929121 is 12192972111.

The square root of 11127929121 is 105489.

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

It is not a de Polignac number, because 11127929121 - 2⁷ = 11127928993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11127929123) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 2846250 + ... + 2850156.

Almost surely, 2^11127929121 is an apocalyptic number.

11127929121 is the 105489-th square number.

11127929121 is the 52745-th centered octagonal number.

It is an amenable number.

11127929121 is a deficient number, since it is larger than the sum of its proper divisors (5560603680).

11127929121 is an frugal number, since it uses more digits than its factorization.

11127929121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7832 (or 3910 counting only the distinct ones).

The product of its digits is 4536, while the sum is 36.

Multiplying 11127929121 by its sum of digits (36), we get a square (400605448356 = 632934²).

The spelling of 11127929121 in words is "eleven billion, one hundred twenty-seven million, nine hundred twenty-nine thousand, one hundred twenty-one".