21250232133 has 16 divisors (see below), whose sum is σ = 30695876736. Its totient is φ = 12998756160.

The previous prime is 21250232077. The next prime is 21250232147. The reversal of 21250232133 is 33123205212.

It is a happy number.

It is not a de Polignac number, because 21250232133 - 2²⁵ = 21216677701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21250232233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1624858 + ... + 1637883.

It is an arithmetic number, because the mean of its divisors is an integer number (1918492296).

Almost surely, 2^21250232133 is an apocalyptic number.

It is an amenable number.

21250232133 is a deficient number, since it is larger than the sum of its proper divisors (9445644603).

21250232133 is a wasteful number, since it uses less digits than its factorization.

21250232133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3262924.

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 21250232133 its reverse (33123205212), we get a palindrome (54373437345).

The spelling of 21250232133 in words is "twenty-one billion, two hundred fifty million, two hundred thirty-two thousand, one hundred thirty-three".