21214053 has 24 divisors (see below), whose sum is σ = 35450688. Its totient is φ = 11973312.

The previous prime is 21214049. The next prime is 21214087. The reversal of 21214053 is 35041212.

It is not a de Polignac number, because 21214053 - 2² = 21214049 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3201 + ... + 7257.

It is an arithmetic number, because the mean of its divisors is an integer number (1477112).

Almost surely, 2^21214053 is an apocalyptic number.

It is an amenable number.

21214053 is a deficient number, since it is larger than the sum of its proper divisors (14236635).

21214053 is a wasteful number, since it uses less digits than its factorization.

21214053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4153 (or 4150 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21214053 is about 4605.8715787568. The cubic root of 21214053 is about 276.8266410827.

Adding to 21214053 its reverse (35041212), we get a palindrome (56255265).

The spelling of 21214053 in words is "twenty-one million, two hundred fourteen thousand, fifty-three".