221377742 has 4 divisors (see below), whose sum is σ = 332066616. Its totient is φ = 110688870.

The previous prime is 221377711. The next prime is 221377763. The reversal of 221377742 is 247773122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 247773122 = 2 ⋅123886561.

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, 55344434 + ... + 55344437.

It is an arithmetic number, because the mean of its divisors is an integer number (83016654).

Almost surely, 2^221377742 is an apocalyptic number.

221377742 is a deficient number, since it is larger than the sum of its proper divisors (110688874).

221377742 is a wasteful number, since it uses less digits than its factorization.

221377742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110688873.

The product of its digits is 32928, while the sum is 35.

The square root of 221377742 is about 14878.7681613768. The cubic root of 221377742 is about 604.9386291139.

The spelling of 221377742 in words is "two hundred twenty-one million, three hundred seventy-seven thousand, seven hundred forty-two".