221497956382 has 16 divisors (see below), whose sum is σ = 350489007360. Its totient is φ = 104693467032.

The previous prime is 221497956331. The next prime is 221497956389. The reversal of 221497956382 is 283659794122.

It is a super-2 number, since 2×221497956382² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221497956389) 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, 6277108 + ... + 6312295.

It is an arithmetic number, because the mean of its divisors is an integer number (21905562960).

Almost surely, 2^221497956382 is an apocalyptic number.

221497956382 is a deficient number, since it is larger than the sum of its proper divisors (128991050978).

221497956382 is a wasteful number, since it uses less digits than its factorization.

221497956382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12589887.

The product of its digits is 13063680, while the sum is 58.

The spelling of 221497956382 in words is "two hundred twenty-one billion, four hundred ninety-seven million, nine hundred fifty-six thousand, three hundred eighty-two".