21256348 has 6 divisors (see below), whose sum is σ = 37198616. Its totient is φ = 10628172.

The previous prime is 21256331. The next prime is 21256369. The reversal of 21256348 is 84365212.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2657040 + ... + 2657047.

Almost surely, 2^21256348 is an apocalyptic number.

It is an amenable number.

21256348 is a deficient number, since it is larger than the sum of its proper divisors (15942268).

21256348 is a wasteful number, since it uses less digits than its factorization.

21256348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5314091 (or 5314089 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 21256348 is about 4610.4607145057. The cubic root of 21256348 is about 277.0104910726.

The spelling of 21256348 in words is "twenty-one million, two hundred fifty-six thousand, three hundred forty-eight".