1101001020021 has 12 divisors (see below), whose sum is σ = 1817525493472. Its totient is φ = 629143439976.

The previous prime is 1101001020019. The next prime is 1101001020023. The reversal of 1101001020021 is 1200201001011.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1101001020019) and next prime (1101001020023).

It is not a de Polignac number, because 1101001020021 - 2¹ = 1101001020019 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1101001019985 and 1101001020012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101001020023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8738103271 + ... + 8738103396.

Almost surely, 2^{1101001020021} is an apocalyptic number.

It is an amenable number.

1101001020021 is a deficient number, since it is larger than the sum of its proper divisors (716524473451).

1101001020021 is a wasteful number, since it uses less digits than its factorization.

1101001020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17476206680 (or 17476206677 counting only the distinct ones).

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

Adding to 1101001020021 its reverse (1200201001011), we get a palindrome (2301202021032).

The spelling of 1101001020021 in words is "one trillion, one hundred one billion, one million, twenty thousand, twenty-one".