21136053 has 8 divisors (see below), whose sum is σ = 28227808. Its totient is φ = 14067504.

The previous prime is 21136039. The next prime is 21136067. The reversal of 21136053 is 35063112.

It is an interprime number because it is at equal distance from previous prime (21136039) and next prime (21136067).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21136053 - 2⁸ = 21135797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21136153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3550 + ... + 7407.

It is an arithmetic number, because the mean of its divisors is an integer number (3528476).

Almost surely, 2^21136053 is an apocalyptic number.

It is an amenable number.

21136053 is a deficient number, since it is larger than the sum of its proper divisors (7091755).

21136053 is a wasteful number, since it uses less digits than its factorization.

21136053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11603.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 21136053 is about 4597.3963283580. The cubic root of 21136053 is about 276.4869449390.

Adding to 21136053 its reverse (35063112), we get a palindrome (56199165).

The spelling of 21136053 in words is "twenty-one million, one hundred thirty-six thousand, fifty-three".