1020010011021 has 24 divisors (see below), whose sum is σ = 1528263953216. Its totient is φ = 655094018880.

The previous prime is 1020010010963. The next prime is 1020010011023. The reversal of 1020010011021 is 1201100100201.

It is a happy number.

It is not a de Polignac number, because 1020010011021 - 2¹⁹ = 1020009486733 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 Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1020010010994 and 1020010011012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020010011023) 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, 18024385 + ... + 18080886.

Almost surely, 2^{1020010011021} is an apocalyptic number.

It is an amenable number.

1020010011021 is a deficient number, since it is larger than the sum of its proper divisors (508253942195).

1020010011021 is a wasteful number, since it uses less digits than its factorization.

1020010011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36105393 (or 36105390 counting only the distinct ones).

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

Adding to 1020010011021 its reverse (1201100100201), we get a palindrome (2221110111222).

The spelling of 1020010011021 in words is "one trillion, twenty billion, ten million, eleven thousand, twenty-one".