1011100002021 has 16 divisors (see below), whose sum is σ = 1503754444800. Its totient is φ = 671443835904.

The previous prime is 1011100001999. The next prime is 1011100002043. The reversal of 1011100002021 is 1202000011101.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1011100001999) and next prime (1011100002043).

It is not a de Polignac number, because 1011100002021 - 2⁷ = 1011100001893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1011100001994 and 1011100002012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011100002061) 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, 72849381 + ... + 72863258.

It is an arithmetic number, because the mean of its divisors is an integer number (93984652800).

Almost surely, 2^{1011100002021} is an apocalyptic number.

It is an amenable number.

1011100002021 is a deficient number, since it is larger than the sum of its proper divisors (492654442779).

1011100002021 is a wasteful number, since it uses less digits than its factorization.

1011100002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145712905 (or 145712899 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1011100002021 its reverse (1202000011101), we get a palindrome (2213100013122).

The spelling of 1011100002021 in words is "one trillion, eleven billion, one hundred million, two thousand, twenty-one".