221403427694 has 4 divisors (see below), whose sum is σ = 332105141544. Its totient is φ = 110701713846.

The previous prime is 221403427681. The next prime is 221403427699. The reversal of 221403427694 is 496724304122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 496724304122 = 2 ⋅248362152061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221403427699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55350856922 + ... + 55350856925.

It is an arithmetic number, because the mean of its divisors is an integer number (83026285386).

Almost surely, 2^221403427694 is an apocalyptic number.

221403427694 is a deficient number, since it is larger than the sum of its proper divisors (110701713850).

221403427694 is a wasteful number, since it uses less digits than its factorization.

221403427694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110701713849.

The product of its (nonzero) digits is 580608, while the sum is 44.

The spelling of 221403427694 in words is "two hundred twenty-one billion, four hundred three million, four hundred twenty-seven thousand, six hundred ninety-four".