21286088 has 16 divisors (see below), whose sum is σ = 41199360. Its totient is φ = 10299600.

The previous prime is 21286081. The next prime is 21286103. The reversal of 21286088 is 88068212.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21286081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42668 + ... + 43163.

It is an arithmetic number, because the mean of its divisors is an integer number (2574960).

Almost surely, 2^21286088 is an apocalyptic number.

It is an amenable number.

21286088 is a deficient number, since it is larger than the sum of its proper divisors (19913272).

21286088 is a wasteful number, since it uses less digits than its factorization.

21286088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85868 (or 85864 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 21286088 is about 4613.6848613662. The cubic root of 21286088 is about 277.1396203864.

The spelling of 21286088 in words is "twenty-one million, two hundred eighty-six thousand, eighty-eight".