21750607405 has 8 divisors (see below), whose sum is σ = 27000754200. Its totient is φ = 16800469056.

The previous prime is 21750607387. The next prime is 21750607423. The reversal of 21750607405 is 50470605712.

It is an interprime number because it is at equal distance from previous prime (21750607387) and next prime (21750607423).

It can be written as a sum of positive squares in 4 ways, for example, as 6837801481 + 14912805924 = 82691^2 + 122118^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21750607405 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 75001950 + ... + 75002239.

It is an arithmetic number, because the mean of its divisors is an integer number (3375094275).

Almost surely, 2^21750607405 is an apocalyptic number.

It is an amenable number.

21750607405 is a deficient number, since it is larger than the sum of its proper divisors (5250146795).

21750607405 is a wasteful number, since it uses less digits than its factorization.

21750607405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150004223.

The product of its (nonzero) digits is 58800, while the sum is 37.

The spelling of 21750607405 in words is "twenty-one billion, seven hundred fifty million, six hundred seven thousand, four hundred five".