221323120404 has 12 divisors (see below), whose sum is σ = 516420614304. Its totient is φ = 73774373464.

The previous prime is 221323120397. The next prime is 221323120429. The reversal of 221323120404 is 404021323122.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×221323120404² (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 in 3 ways as a sum of consecutive naturals, for example, 9221796672 + ... + 9221796695.

It is an arithmetic number, because the mean of its divisors is an integer number (43035051192).

Almost surely, 2^221323120404 is an apocalyptic number.

It is an amenable number.

221323120404 is an abundant number, since it is smaller than the sum of its proper divisors (295097493900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221323120404 is a wasteful number, since it uses less digits than its factorization.

221323120404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18443593374 (or 18443593372 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 221323120404 its reverse (404021323122), we get a palindrome (625344443526).

The spelling of 221323120404 in words is "two hundred twenty-one billion, three hundred twenty-three million, one hundred twenty thousand, four hundred four".