21155014 has 4 divisors (see below), whose sum is σ = 31732524. Its totient is φ = 10577506.

The previous prime is 21154997. The next prime is 21155027. The reversal of 21155014 is 41055112.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21154982 and 21155000.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5288752 + ... + 5288755.

It is an arithmetic number, because the mean of its divisors is an integer number (7933131).

Almost surely, 2^21155014 is an apocalyptic number.

21155014 is a deficient number, since it is larger than the sum of its proper divisors (10577510).

21155014 is a wasteful number, since it uses less digits than its factorization.

21155014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10577509.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 21155014 is about 4599.4580115488. The cubic root of 21155014 is about 276.5695983729.

It can be divided in two parts, 211 and 55014, that added together give a square (55225 = 235²).

The spelling of 21155014 in words is "twenty-one million, one hundred fifty-five thousand, fourteen".