21043233526 has 32 divisors (see below), whose sum is σ = 36832112640. Its totient is φ = 8829746016.

The previous prime is 21043233521. The next prime is 21043233553. The reversal of 21043233526 is 62533234012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043233521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 325815 + ... + 385021.

It is an arithmetic number, because the mean of its divisors is an integer number (1151003520).

Almost surely, 2^21043233526 is an apocalyptic number.

21043233526 is a deficient number, since it is larger than the sum of its proper divisors (15788879114).

21043233526 is a wasteful number, since it uses less digits than its factorization.

21043233526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59748.

The product of its (nonzero) digits is 25920, while the sum is 31.

Adding to 21043233526 its reverse (62533234012), we get a palindrome (83576467538).

The spelling of 21043233526 in words is "twenty-one billion, forty-three million, two hundred thirty-three thousand, five hundred twenty-six".