21260076 has 12 divisors (see below), whose sum is σ = 49606872. Its totient is φ = 7086688.

The previous prime is 21260051. The next prime is 21260077. The reversal of 21260076 is 67006212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (21260077) 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 in 3 ways as a sum of consecutive naturals, for example, 885825 + ... + 885848.

It is an arithmetic number, because the mean of its divisors is an integer number (4133906).

Almost surely, 2^21260076 is an apocalyptic number.

It is an amenable number.

21260076 is an abundant number, since it is smaller than the sum of its proper divisors (28346796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21260076 is a wasteful number, since it uses less digits than its factorization.

21260076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1771680 (or 1771678 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21260076 is about 4610.8649947705. The cubic root of 21260076 is about 277.0266844273.

Adding to 21260076 its reverse (67006212), we get a palindrome (88266288).

It can be divided in two parts, 2 and 1260076, that added together give a triangular number (1260078 = T₁₅₈₇).

The spelling of 21260076 in words is "twenty-one million, two hundred sixty thousand, seventy-six".