1021111101021 has 32 divisors (see below), whose sum is σ = 1550356236288. Its totient is φ = 591746978240.

The previous prime is 1021111101007. The next prime is 1021111101053. The reversal of 1021111101021 is 1201011111201.

It is not a de Polignac number, because 1021111101021 - 2²⁵ = 1021077546589 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1021111100988 and 1021111101006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021111101061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2016880 + ... + 2471846.

It is an arithmetic number, because the mean of its divisors is an integer number (48448632384).

Almost surely, 2^{1021111101021} is an apocalyptic number.

1021111101021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1021111101021 is a deficient number, since it is larger than the sum of its proper divisors (529245135267).

1021111101021 is a wasteful number, since it uses less digits than its factorization.

1021111101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457961.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 1021111101021 its reverse (1201011111201), we get a palindrome (2222122212222).

The spelling of 1021111101021 in words is "one trillion, twenty-one billion, one hundred eleven million, one hundred one thousand, twenty-one".