215854881244 has 24 divisors (see below), whose sum is σ = 381225520368. Its totient is φ = 106933989120.

The previous prime is 215854881217. The next prime is 215854881259. The reversal of 215854881244 is 442188458512.

It is a super-2 number, since 2×215854881244² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 215854881191 and 215854881200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1198159 + ... + 1366489.

It is an arithmetic number, because the mean of its divisors is an integer number (15884396682).

Almost surely, 2^215854881244 is an apocalyptic number.

It is an amenable number.

215854881244 is a deficient number, since it is larger than the sum of its proper divisors (165370639124).

215854881244 is a wasteful number, since it uses less digits than its factorization.

215854881244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171285 (or 171283 counting only the distinct ones).

The product of its digits is 3276800, while the sum is 52.

The spelling of 215854881244 in words is "two hundred fifteen billion, eight hundred fifty-four million, eight hundred eighty-one thousand, two hundred forty-four".