21042625133 has 4 divisors (see below), whose sum is σ = 21065523360. Its totient is φ = 21019726908.

The previous prime is 21042625061. The next prime is 21042625151. The reversal of 21042625133 is 33152624012.

It is a happy number.

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 21042625133 - 2¹⁶ = 21042559597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21042625096 and 21042625105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042625333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11447735 + ... + 11449572.

It is an arithmetic number, because the mean of its divisors is an integer number (5266380840).

Almost surely, 2^21042625133 is an apocalyptic number.

It is an amenable number.

21042625133 is a deficient number, since it is larger than the sum of its proper divisors (22898227).

21042625133 is an equidigital number, since it uses as much as digits as its factorization.

21042625133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22898226.

The product of its (nonzero) digits is 8640, while the sum is 29.

The spelling of 21042625133 in words is "twenty-one billion, forty-two million, six hundred twenty-five thousand, one hundred thirty-three".