21381262 has 16 divisors (see below), whose sum is σ = 37157472. Its totient is φ = 9037440.

The previous prime is 21381259. The next prime is 21381281. The reversal of 21381262 is 26218312.

It is a congruent 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, 9439 + ... + 11482.

It is an arithmetic number, because the mean of its divisors is an integer number (2322342).

Almost surely, 2^21381262 is an apocalyptic number.

21381262 is a deficient number, since it is larger than the sum of its proper divisors (15776210).

21381262 is a wasteful number, since it uses less digits than its factorization.

21381262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21003.

The product of its digits is 1152, while the sum is 25.

The square root of 21381262 is about 4623.9876729939. The cubic root of 21381262 is about 277.5520536499.

Adding to 21381262 its reverse (26218312), we get a palindrome (47599574).

The spelling of 21381262 in words is "twenty-one million, three hundred eighty-one thousand, two hundred sixty-two".