21320126 has 16 divisors (see below), whose sum is σ = 34449408. Its totient is φ = 9867000.

The previous prime is 21320107. The next prime is 21320183. The reversal of 21320126 is 62102312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6050 + ... + 8901.

It is an arithmetic number, because the mean of its divisors is an integer number (2153088).

Almost surely, 2^21320126 is an apocalyptic number.

21320126 is a deficient number, since it is larger than the sum of its proper divisors (13129282).

21320126 is a wasteful number, since it uses less digits than its factorization.

21320126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15007.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 21320126 is about 4617.3721963905. The cubic root of 21320126 is about 277.2872638409.

Adding to 21320126 its reverse (62102312), we get a palindrome (83422438).

The spelling of 21320126 in words is "twenty-one million, three hundred twenty thousand, one hundred twenty-six".