21262146 has 16 divisors (see below), whose sum is σ = 42679008. Its totient is φ = 7061600.

The previous prime is 21262117. The next prime is 21262147. The reversal of 21262146 is 64126212.

It is not an unprimeable number, because it can be changed into a prime (21262147) 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 7 ways as a sum of consecutive naturals, for example, 4620 + ... + 7991.

It is an arithmetic number, because the mean of its divisors is an integer number (2667438).

Almost surely, 2^21262146 is an apocalyptic number.

21262146 is an abundant number, since it is smaller than the sum of its proper divisors (21416862).

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

21262146 is a wasteful number, since it uses less digits than its factorization.

21262146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12897.

The product of its digits is 1152, while the sum is 24.

The square root of 21262146 is about 4611.0894591192. The cubic root of 21262146 is about 277.0356750917.

Adding to 21262146 its reverse (64126212), we get a palindrome (85388358).

The spelling of 21262146 in words is "twenty-one million, two hundred sixty-two thousand, one hundred forty-six".