221020100007 has 16 divisors (see below), whose sum is σ = 337495664640. Its totient is φ = 126033525792.

The previous prime is 221020099999. The next prime is 221020100009. The reversal of 221020100007 is 700001020122.

It is not a de Polignac number, because 221020100007 - 2³ = 221020099999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020100009) 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, 10976128 + ... + 10996245.

It is an arithmetic number, because the mean of its divisors is an integer number (21093479040).

Almost surely, 2^221020100007 is an apocalyptic number.

221020100007 is a deficient number, since it is larger than the sum of its proper divisors (116475564633).

221020100007 is a wasteful number, since it uses less digits than its factorization.

221020100007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21972862.

The product of its (nonzero) digits is 56, while the sum is 15.

Adding to 221020100007 its reverse (700001020122), we get a palindrome (921021120129).

The spelling of 221020100007 in words is "two hundred twenty-one billion, twenty million, one hundred thousand, seven".