1020000111021 has 24 divisors (see below), whose sum is σ = 1483608890400. Its totient is φ = 675259968096.

The previous prime is 1020000111019. The next prime is 1020000111023. The reversal of 1020000111021 is 1201110000201.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1020000111019) and next prime (1020000111023).

It is not a de Polignac number, because 1020000111021 - 2¹ = 1020000111019 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 = 1020000110994 and 1020000111012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020000111023) 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, 5141946 + ... + 5336628.

It is an arithmetic number, because the mean of its divisors is an integer number (61817037100).

Almost surely, 2^{1020000111021} is an apocalyptic number.

It is an amenable number.

1020000111021 is a deficient number, since it is larger than the sum of its proper divisors (463608779379).

1020000111021 is a wasteful number, since it uses less digits than its factorization.

1020000111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198745 (or 198742 counting only the distinct ones).

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

Adding to 1020000111021 its reverse (1201110000201), we get a palindrome (2221110111222).

The spelling of 1020000111021 in words is "one trillion, twenty billion, one hundred eleven thousand, twenty-one".