21127149 has 28 divisors (see below), whose sum is σ = 32191036. Its totient is φ = 13856832.

The previous prime is 21127121. The next prime is 21127159. The reversal of 21127149 is 94172112.

It can be written as a sum of positive squares in 2 ways, for example, as 13089924 + 8037225 = 3618^2 + 2835^2 .

It is not a de Polignac number, because 21127149 - 2⁷ = 21127021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21127159) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 53019 + ... + 53415.

Almost surely, 2^21127149 is an apocalyptic number.

It is an amenable number.

21127149 is a deficient number, since it is larger than the sum of its proper divisors (11063887).

21127149 is an frugal number, since it uses more digits than its factorization.

With its successor (21127150) it forms an eRAP, since the sums of their prime factors are consecutive (488 and 489).

21127149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488 (or 473 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 21127149 is about 4596.4278521478. The cubic root of 21127149 is about 276.4481142021.

It can be divided in two parts, 2112 and 7149, that added together give a cube (9261 = 21³).

The spelling of 21127149 in words is "twenty-one million, one hundred twenty-seven thousand, one hundred forty-nine".