21857237050 has 48 divisors (see below), whose sum is σ = 44544247200. Its totient is φ = 7913332800.

The previous prime is 21857237029. The next prime is 21857237113. The reversal of 21857237050 is 5073275812.

It is a happy number.

It is a super-2 number, since 2×21857237050² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21857236994 and 21857237012.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39181 + ... + 212719.

It is an arithmetic number, because the mean of its divisors is an integer number (928005150).

Almost surely, 2^21857237050 is an apocalyptic number.

21857237050 is an abundant number, since it is smaller than the sum of its proper divisors (22687010150).

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

21857237050 is a wasteful number, since it uses less digits than its factorization.

21857237050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173791 (or 173786 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 40.

The spelling of 21857237050 in words is "twenty-one billion, eight hundred fifty-seven million, two hundred thirty-seven thousand, fifty".