21277133 has 8 divisors (see below), whose sum is σ = 21621600. Its totient is φ = 20934928.

The previous prime is 21277121. The next prime is 21277153. The reversal of 21277133 is 33177212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21277133 - 2⁴ = 21277117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21277153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31958 + ... + 32616.

It is an arithmetic number, because the mean of its divisors is an integer number (2702700).

Almost surely, 2^21277133 is an apocalyptic number.

It is an amenable number.

21277133 is a deficient number, since it is larger than the sum of its proper divisors (344467).

21277133 is an equidigital number, since it uses as much as digits as its factorization.

21277133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131.

The product of its digits is 1764, while the sum is 26.

The square root of 21277133 is about 4612.7142768656. The cubic root of 21277133 is about 277.1007509707.

The spelling of 21277133 in words is "twenty-one million, two hundred seventy-seven thousand, one hundred thirty-three".