2111020220021 has 4 divisors (see below), whose sum is σ = 2202803707872. Its totient is φ = 2019236732172.

The previous prime is 2111020219999. The next prime is 2111020220053. The reversal of 2111020220021 is 1200220201112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2111020220021 - 2¹⁴ = 2111020203637 is a prime.

It is a super-2 number, since 2×2111020220021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111020219978 and 2111020220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111020220321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45891743891 + ... + 45891743936.

It is an arithmetic number, because the mean of its divisors is an integer number (550700926968).

Almost surely, 2^{2111020220021} is an apocalyptic number.

It is an amenable number.

2111020220021 is a deficient number, since it is larger than the sum of its proper divisors (91783487851).

2111020220021 is an equidigital number, since it uses as much as digits as its factorization.

2111020220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91783487850.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2111020220021 its reverse (1200220201112), we get a palindrome (3311240421133).

The spelling of 2111020220021 in words is "two trillion, one hundred eleven billion, twenty million, two hundred twenty thousand, twenty-one".