21857270145860 has 48 divisors (see below), whose sum is σ = 45948401328816. Its totient is φ = 8733743327232.

The previous prime is 21857270145857. The next prime is 21857270145869. The reversal of 21857270145860 is 6854107275812.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 209615634244 + 21647654511616 = 457838^2 + 4652704^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21857270145796 and 21857270145805.

It is not an unprimeable number, because it can be changed into a prime (21857270145869) 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, 97783184 + ... + 98006456.

It is an arithmetic number, because the mean of its divisors is an integer number (957258361017).

Almost surely, 2^{21857270145860} is an apocalyptic number.

21857270145860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21857270145860 is an abundant number, since it is smaller than the sum of its proper divisors (24091131182956).

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

21857270145860 is a wasteful number, since it uses less digits than its factorization.

21857270145860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228392 (or 228390 counting only the distinct ones).

The product of its (nonzero) digits is 7526400, while the sum is 56.

The spelling of 21857270145860 in words is "twenty-one trillion, eight hundred fifty-seven billion, two hundred seventy million, one hundred forty-five thousand, eight hundred sixty".