21277149 has 16 divisors (see below), whose sum is σ = 30424320. Its totient is φ = 13178880.

The previous prime is 21277121. The next prime is 21277153. The reversal of 21277149 is 94177212.

It is not a de Polignac number, because 21277149 - 2⁵ = 21277117 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21277159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1389 + ... + 6669.

It is an arithmetic number, because the mean of its divisors is an integer number (1901520).

Almost surely, 2^21277149 is an apocalyptic number.

It is an amenable number.

21277149 is a deficient number, since it is larger than the sum of its proper divisors (9147171).

21277149 is a wasteful number, since it uses less digits than its factorization.

21277149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5380.

The product of its digits is 7056, while the sum is 33.

The square root of 21277149 is about 4612.7160112021. The cubic root of 21277149 is about 277.1008204289.

The spelling of 21277149 in words is "twenty-one million, two hundred seventy-seven thousand, one hundred forty-nine".