221228731382 has 4 divisors (see below), whose sum is σ = 331843097076. Its totient is φ = 110614365690.

The previous prime is 221228731363. The next prime is 221228731433. The reversal of 221228731382 is 283137822122.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×221228731382² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55307182844 + ... + 55307182847.

It is an arithmetic number, because the mean of its divisors is an integer number (82960774269).

Almost surely, 2^221228731382 is an apocalyptic number.

221228731382 is a deficient number, since it is larger than the sum of its proper divisors (110614365694).

221228731382 is a wasteful number, since it uses less digits than its factorization.

221228731382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110614365693.

The product of its digits is 129024, while the sum is 41.

The spelling of 221228731382 in words is "two hundred twenty-one billion, two hundred twenty-eight million, seven hundred thirty-one thousand, three hundred eighty-two".