21152642 has 16 divisors (see below), whose sum is σ = 36408960. Its totient is φ = 9028608.

The previous prime is 21152591. The next prime is 21152657. The reversal of 21152642 is 24625112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 659 + ... + 6537.

It is an arithmetic number, because the mean of its divisors is an integer number (2275560).

Almost surely, 2^21152642 is an apocalyptic number.

21152642 is a deficient number, since it is larger than the sum of its proper divisors (15256318).

21152642 is a wasteful number, since it uses less digits than its factorization.

21152642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6145.

The product of its digits is 960, while the sum is 23.

The square root of 21152642 is about 4599.2001478518. The cubic root of 21152642 is about 276.5592612237.

Adding to 21152642 its reverse (24625112), we get a palindrome (45777754).

The spelling of 21152642 in words is "twenty-one million, one hundred fifty-two thousand, six hundred forty-two".