221243201001 has 24 divisors (see below), whose sum is σ = 328283706504. Its totient is φ = 143477153280.

The previous prime is 221243200973. The next prime is 221243201027. The reversal of 221243201001 is 100102342122.

It is a happy number.

221243201001 is a `hidden beast` number, since 221 + 2 + 432 + 0 + 10 + 0 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 62480001600 + 158763199401 = 249960^2 + 398451^2 .

It is not a de Polignac number, because 221243201001 - 2¹³ = 221243192809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221243201041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1472481 + ... + 1615761.

It is an arithmetic number, because the mean of its divisors is an integer number (13678487771).

Almost surely, 2^221243201001 is an apocalyptic number.

It is an amenable number.

221243201001 is a deficient number, since it is larger than the sum of its proper divisors (107040505503).

221243201001 is a wasteful number, since it uses less digits than its factorization.

221243201001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147961 (or 147958 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 221243201001 its reverse (100102342122), we get a palindrome (321345543123).

The spelling of 221243201001 in words is "two hundred twenty-one billion, two hundred forty-three million, two hundred one thousand, one".