21526053 has 4 divisors (see below), whose sum is σ = 28701408. Its totient is φ = 14350700.

The previous prime is 21526049. The next prime is 21526061. The reversal of 21526053 is 35062512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21526053 - 2² = 21526049 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21526553) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 3587673 + ... + 3587678.

It is an arithmetic number, because the mean of its divisors is an integer number (7175352).

Almost surely, 2^21526053 is an apocalyptic number.

It is an amenable number.

21526053 is a deficient number, since it is larger than the sum of its proper divisors (7175355).

21526053 is an equidigital number, since it uses as much as digits as its factorization.

21526053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7175354.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 21526053 is about 4639.6177644284. The cubic root of 21526053 is about 278.1771596488.

Adding to 21526053 its reverse (35062512), we get a palindrome (56588565).

The spelling of 21526053 in words is "twenty-one million, five hundred twenty-six thousand, fifty-three".