21254662 has 16 divisors (see below), whose sum is σ = 37456272. Its totient is φ = 8917920.

The previous prime is 21254647. The next prime is 21254677. The reversal of 21254662 is 26645212.

It is an interprime number because it is at equal distance from previous prime (21254647) and next prime (21254677).

It is a self number, because there is not a number n which added to its sum of digits gives 21254662.

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, 36873 + ... + 37444.

It is an arithmetic number, because the mean of its divisors is an integer number (2341017).

Almost surely, 2^21254662 is an apocalyptic number.

21254662 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21254662 is a deficient number, since it is larger than the sum of its proper divisors (16201610).

21254662 is a wasteful number, since it uses less digits than its factorization.

21254662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74343.

The product of its digits is 5760, while the sum is 28.

The square root of 21254662 is about 4610.2778658124. The cubic root of 21254662 is about 277.0031669541.

Adding to 21254662 its reverse (26645212), we get a palindrome (47899874).

The spelling of 21254662 in words is "twenty-one million, two hundred fifty-four thousand, six hundred sixty-two".