2221100220021 has 16 divisors (see below), whose sum is σ = 2963653724544. Its totient is φ = 1479640345344.

The previous prime is 2221100219999. The next prime is 2221100220047. The reversal of 2221100220021 is 1200220011222.

It is not a de Polignac number, because 2221100220021 - 2⁹ = 2221100219509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221100220421) 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, 43037985 + ... + 43089561.

It is an arithmetic number, because the mean of its divisors is an integer number (185228357784).

Almost surely, 2^{2221100220021} is an apocalyptic number.

It is an amenable number.

2221100220021 is a deficient number, since it is larger than the sum of its proper divisors (742553504523).

2221100220021 is a wasteful number, since it uses less digits than its factorization.

2221100220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61900.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 2221100220021 its reverse (1200220011222), we get a palindrome (3421320231243).

The spelling of 2221100220021 in words is "two trillion, two hundred twenty-one billion, one hundred million, two hundred twenty thousand, twenty-one".