1011221111021 has 8 divisors (see below), whose sum is σ = 1103159183904. Its totient is φ = 919284518320.

The previous prime is 1011221110997. The next prime is 1011221111029. The reversal of 1011221111021 is 1201111221101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1011221111021 - 2³⁰ = 1010147369197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011221110987 and 1011221111005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011221111029) 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 7 ways as a sum of consecutive naturals, for example, 1445891 + ... + 2028063.

It is an arithmetic number, because the mean of its divisors is an integer number (137894897988).

Almost surely, 2^{1011221111021} is an apocalyptic number.

1011221111021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1011221111021 is a deficient number, since it is larger than the sum of its proper divisors (91938072883).

1011221111021 is a wasteful number, since it uses less digits than its factorization.

1011221111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740091.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1011221111021 its reverse (1201111221101), we get a palindrome (2212332332122).

The spelling of 1011221111021 in words is "one trillion, eleven billion, two hundred twenty-one million, one hundred eleven thousand, twenty-one".