2111011220021 has 16 divisors (see below), whose sum is σ = 2313577351680. Its totient is φ = 1910223544320.

The previous prime is 2111011219997. The next prime is 2111011220051. The reversal of 2111011220021 is 1200221101112.

It is a cyclic number.

It is not a de Polignac number, because 2111011220021 - 2¹⁰ = 2111011218997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111011219978 and 2111011220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111011220051) 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, 18313061 + ... + 18427973.

It is an arithmetic number, because the mean of its divisors is an integer number (144598584480).

Almost surely, 2^{2111011220021} is an apocalyptic number.

It is an amenable number.

2111011220021 is a deficient number, since it is larger than the sum of its proper divisors (202566131659).

2111011220021 is a wasteful number, since it uses less digits than its factorization.

2111011220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122636.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2111011220021 its reverse (1200221101112), we get a palindrome (3311232321133).

The spelling of 2111011220021 in words is "two trillion, one hundred eleven billion, eleven million, two hundred twenty thousand, twenty-one".