221853377864 has 16 divisors (see below), whose sum is σ = 421673373420. Its totient is φ = 109407144960.

The previous prime is 221853377839. The next prime is 221853377929. The reversal of 221853377864 is 468773358122.

It can be written as a sum of positive squares in 2 ways, for example, as 213601108900 + 8252268964 = 462170^2 + 90842^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189942377 + ... + 189943544.

Almost surely, 2^221853377864 is an apocalyptic number.

It is an amenable number.

221853377864 is a deficient number, since it is larger than the sum of its proper divisors (199819995556).

221853377864 is a wasteful number, since it uses less digits than its factorization.

221853377864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379886000 (or 379885996 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 56.

The spelling of 221853377864 in words is "two hundred twenty-one billion, eight hundred fifty-three million, three hundred seventy-seven thousand, eight hundred sixty-four".