221020102100001 has 16 divisors (see below), whose sum is σ = 310040064125568. Its totient is φ = 139867698096000.

The previous prime is 221020102099999. The next prime is 221020102100069. The reversal of 221020102100001 is 100001201020122.

It is not a de Polignac number, because 221020102100001 - 2¹ = 221020102099999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221020102100001.

It is not an unprimeable number, because it can be changed into a prime (221020102100071) 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, 24282581925 + ... + 24282591026.

It is an arithmetic number, because the mean of its divisors is an integer number (19377504007848).

Almost surely, 2^{221020102100001} is an apocalyptic number.

It is an amenable number.

221020102100001 is a deficient number, since it is larger than the sum of its proper divisors (89019962025567).

221020102100001 is a wasteful number, since it uses less digits than its factorization.

221020102100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48565173032.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221020102100001 its reverse (100001201020122), we get a palindrome (321021303120123).

The spelling of 221020102100001 in words is "two hundred twenty-one trillion, twenty billion, one hundred two million, one hundred thousand, one".