1111211122021 has 16 divisors (see below), whose sum is σ = 1491975773568. Its totient is φ = 799272734400.

The previous prime is 1111211121997. The next prime is 1111211122079. The reversal of 1111211122021 is 1202211121111.

It is not a de Polignac number, because 1111211122021 - 2²⁵ = 1111177567589 is a prime.

It is a super-2 number, since 2×1111211122021² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1111211121986 and 1111211122004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111211125021) 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, 555049510 + ... + 555051511.

It is an arithmetic number, because the mean of its divisors is an integer number (93248485848).

Almost surely, 2^{1111211122021} is an apocalyptic number.

1111211122021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1111211122021 is a deficient number, since it is larger than the sum of its proper divisors (380764651547).

1111211122021 is a wasteful number, since it uses less digits than its factorization.

1111211122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110101052.

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

Adding to 1111211122021 its reverse (1202211121111), we get a palindrome (2313422243132).

The spelling of 1111211122021 in words is "one trillion, one hundred eleven billion, two hundred eleven million, one hundred twenty-two thousand, twenty-one".