21277450 has 12 divisors (see below), whose sum is σ = 39576150. Its totient is φ = 8510960.

The previous prime is 21277441. The next prime is 21277457. The reversal of 21277450 is 5477212.

It can be written as a sum of positive squares in 3 ways, for example, as 19280881 + 1996569 = 4391^2 + 1413^2 .

It is not an unprimeable number, because it can be changed into a prime (21277457) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 212725 + ... + 212824.

Almost surely, 2^21277450 is an apocalyptic number.

21277450 is a deficient number, since it is larger than the sum of its proper divisors (18298700).

21277450 is a wasteful number, since it uses less digits than its factorization.

21277450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425561 (or 425556 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 21277450 is about 4612.7486382850. The cubic root of 21277450 is about 277.1021271038.

The spelling of 21277450 in words is "twenty-one million, two hundred seventy-seven thousand, four hundred fifty".