21253562 has 16 divisors (see below), whose sum is σ = 34884000. Its totient is φ = 9631440.

The previous prime is 21253543. The next prime is 21253591. The reversal of 21253562 is 26535212.

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, 7064 + ... + 9612.

It is an arithmetic number, because the mean of its divisors is an integer number (2180250).

Almost surely, 2^21253562 is an apocalyptic number.

21253562 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21253562 is a deficient number, since it is larger than the sum of its proper divisors (13630438).

21253562 is a wasteful number, since it uses less digits than its factorization.

21253562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2941.

The product of its digits is 3600, while the sum is 26.

The square root of 21253562 is about 4610.1585656027. The cubic root of 21253562 is about 276.9983882576.

Adding to 21253562 its reverse (26535212), we get a palindrome (47788774).

The spelling of 21253562 in words is "twenty-one million, two hundred fifty-three thousand, five hundred sixty-two".