21237745050 has 192 divisors, whose sum is σ = 60588979200. Its totient is φ = 5464454400.

The previous prime is 21237745049. The next prime is 21237745051. The reversal of 21237745050 is 5054773212.

It is an interprime number because it is at equal distance from previous prime (21237745049) and next prime (21237745051).

It is a super-3 number, since 3×21237745050³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21237744996 and 21237745014.

It is not an unprimeable number, because it can be changed into a prime (21237745051) 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 95 ways as a sum of consecutive naturals, for example, 21301152 + ... + 21302148.

It is an arithmetic number, because the mean of its divisors is an integer number (315567600).

Almost surely, 2^21237745050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21237745050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30294489600).

21237745050 is an abundant number, since it is smaller than the sum of its proper divisors (39351234150).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21237745050 is a wasteful number, since it uses less digits than its factorization.

21237745050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1558 (or 1547 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 36.

The spelling of 21237745050 in words is "twenty-one billion, two hundred thirty-seven million, seven hundred forty-five thousand, fifty".