221321204102 has 4 divisors (see below), whose sum is σ = 331981806156. Its totient is φ = 110660602050.

The previous prime is 221321204101. The next prime is 221321204107. The reversal of 221321204102 is 201402123122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 201402123122 = 2 ⋅100701061561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221321204101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55330301024 + ... + 55330301027.

It is an arithmetic number, because the mean of its divisors is an integer number (82995451539).

Almost surely, 2^221321204102 is an apocalyptic number.

221321204102 is a deficient number, since it is larger than the sum of its proper divisors (110660602054).

221321204102 is a wasteful number, since it uses less digits than its factorization.

221321204102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110660602053.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 221321204102 its reverse (201402123122), we get a palindrome (422723327224).

The spelling of 221321204102 in words is "two hundred twenty-one billion, three hundred twenty-one million, two hundred four thousand, one hundred two".