21147088 has 10 divisors (see below), whose sum is σ = 40972514. Its totient is φ = 10573536.

The previous prime is 21147083. The next prime is 21147107. The reversal of 21147088 is 88074112.

It can be written as a sum of positive squares in only one way, i.e., 21049744 + 97344 = 4588^2 + 312^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21147083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660831 + ... + 660862.

Almost surely, 2^21147088 is an apocalyptic number.

It is an amenable number.

21147088 is a deficient number, since it is larger than the sum of its proper divisors (19825426).

21147088 is a wasteful number, since it uses less digits than its factorization.

21147088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321701 (or 1321695 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 21147088 is about 4598.5963075704. The cubic root of 21147088 is about 276.5350539310.

The spelling of 21147088 in words is "twenty-one million, one hundred forty-seven thousand, eighty-eight".