2021011221111 has 16 divisors (see below), whose sum is σ = 2696932892160. Its totient is φ = 1346215533120.

The previous prime is 2021011221101. The next prime is 2021011221127. The reversal of 2021011221111 is 1111221101202.

It is a happy number.

It is not a de Polignac number, because 2021011221111 - 2¹¹ = 2021011219063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021011221101) 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, 24937746 + ... + 25018656.

It is an arithmetic number, because the mean of its divisors is an integer number (168558305760).

Almost surely, 2^{2021011221111} is an apocalyptic number.

2021011221111 is a deficient number, since it is larger than the sum of its proper divisors (675921671049).

2021011221111 is a wasteful number, since it uses less digits than its factorization.

2021011221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87766.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 2021011221111 its reverse (1111221101202), we get a palindrome (3132232322313).

The spelling of 2021011221111 in words is "two trillion, twenty-one billion, eleven million, two hundred twenty-one thousand, one hundred eleven".