221201310001 has 12 divisors (see below), whose sum is σ = 257387869620. Its totient is φ = 189548026080.

The previous prime is 221201309993. The next prime is 221201310037. The reversal of 221201310001 is 100013102122.

It can be written as a sum of positive squares in 2 ways, for example, as 193666885776 + 27534424225 = 440076^2 + 165935^2 .

It is not a de Polignac number, because 221201310001 - 2³ = 221201309993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221201310101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 454846 + ... + 805783.

It is an arithmetic number, because the mean of its divisors is an integer number (21448989135).

Almost surely, 2^221201310001 is an apocalyptic number.

It is an amenable number.

221201310001 is a deficient number, since it is larger than the sum of its proper divisors (36186559619).

221201310001 is a wasteful number, since it uses less digits than its factorization.

221201310001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264224 (or 1264217 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 221201310001 its reverse (100013102122), we get a palindrome (321214412123).

The spelling of 221201310001 in words is "two hundred twenty-one billion, two hundred one million, three hundred ten thousand, one".