221868858356 has 24 divisors (see below), whose sum is σ = 397578904800. Its totient is φ = 108278507232.

The previous prime is 221868858353. The next prime is 221868858359. The reversal of 221868858356 is 653858868122.

It is an interprime number because it is at equal distance from previous prime (221868858353) and next prime (221868858359).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221868858353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206531 + ... + 697418.

It is an arithmetic number, because the mean of its divisors is an integer number (16565787700).

Almost surely, 2^221868858356 is an apocalyptic number.

It is an amenable number.

221868858356 is a deficient number, since it is larger than the sum of its proper divisors (175710046444).

221868858356 is a wasteful number, since it uses less digits than its factorization.

221868858356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905423 (or 905421 counting only the distinct ones).

The product of its digits is 44236800, while the sum is 62.

The spelling of 221868858356 in words is "two hundred twenty-one billion, eight hundred sixty-eight million, eight hundred fifty-eight thousand, three hundred fifty-six".