221012001001 has 16 divisors (see below), whose sum is σ = 253809504000. Its totient is φ = 190333400400.

The previous prime is 221012000939. The next prime is 221012001037. The reversal of 221012001001 is 100100210122.

It is a de Polignac number, because none of the positive numbers 2^k-221012001001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221012001071) 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, 5751550 + ... + 5789848.

It is an arithmetic number, because the mean of its divisors is an integer number (15863094000).

Almost surely, 2^221012001001 is an apocalyptic number.

It is an amenable number.

221012001001 is a deficient number, since it is larger than the sum of its proper divisors (32797502999).

221012001001 is a wasteful number, since it uses less digits than its factorization.

221012001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65940.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 221012001001 its reverse (100100210122), we get a palindrome (321112211123).

The spelling of 221012001001 in words is "two hundred twenty-one billion, twelve million, one thousand, one".