221231001201 has 16 divisors (see below), whose sum is σ = 337126508544. Its totient is φ = 126412989264.

The previous prime is 221231001197. The next prime is 221231001269. The reversal of 221231001201 is 102100132122.

It is not a de Polignac number, because 221231001201 - 2² = 221231001197 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221231001701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 423736 + ... + 788678.

It is an arithmetic number, because the mean of its divisors is an integer number (21070406784).

Almost surely, 2^221231001201 is an apocalyptic number.

221231001201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221231001201 is a deficient number, since it is larger than the sum of its proper divisors (115895507343).

221231001201 is a wasteful number, since it uses less digits than its factorization.

221231001201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393820.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 221231001201 its reverse (102100132122), we get a palindrome (323331133323).

The spelling of 221231001201 in words is "two hundred twenty-one billion, two hundred thirty-one million, one thousand, two hundred one".