21288010 has 32 divisors (see below), whose sum is σ = 40499712. Its totient is φ = 8043840.

The previous prime is 21287993. The next prime is 21288013. The reversal of 21288010 is 1088212.

It is not an unprimeable number, because it can be changed into a prime (21288013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12532 + ... + 14128.

It is an arithmetic number, because the mean of its divisors is an integer number (1265616).

Almost surely, 2^21288010 is an apocalyptic number.

21288010 is a deficient number, since it is larger than the sum of its proper divisors (19211702).

21288010 is a wasteful number, since it uses less digits than its factorization.

21288010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 21288010 is about 4613.8931500415. The cubic root of 21288010 is about 277.1479614575.

The spelling of 21288010 in words is "twenty-one million, two hundred eighty-eight thousand, ten".