1100010120021 has 24 divisors (see below), whose sum is σ = 1644357831480. Its totient is φ = 707766224256.

The previous prime is 1100010120017. The next prime is 1100010120023. The reversal of 1100010120021 is 1200210100011.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 27760224996 + 1072249895025 = 166614^2 + 1035495^2 .

It is not a de Polignac number, because 1100010120021 - 2² = 1100010120017 is a prime.

It is a super-2 number, since 2×1100010120021² (a number of 25 digits) contains 22 as substring.

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 = 1100010119985 and 1100010120012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100010120023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 204250 + ... + 1497243.

It is an arithmetic number, because the mean of its divisors is an integer number (68514909645).

Almost surely, 2^{1100010120021} is an apocalyptic number.

It is an amenable number.

1100010120021 is a deficient number, since it is larger than the sum of its proper divisors (544347711459).

1100010120021 is a wasteful number, since it uses less digits than its factorization.

1100010120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1704005 (or 1704002 counting only the distinct ones).

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

Adding to 1100010120021 its reverse (1200210100011), we get a palindrome (2300220220032).

The spelling of 1100010120021 in words is "one trillion, one hundred billion, ten million, one hundred twenty thousand, twenty-one".