1011020002021 has 4 divisors (see below), whose sum is σ = 1011039449472. Its totient is φ = 1011000554572.

The previous prime is 1011020001977. The next prime is 1011020002049. The reversal of 1011020002021 is 1202000201101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1011020002021 - 2¹⁹ = 1011019477733 is a prime.

It is a super-2 number, since 2×1011020002021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011020001989 and 1011020002007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011020072021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9645535 + ... + 9749788.

It is an arithmetic number, because the mean of its divisors is an integer number (252759862368).

Almost surely, 2^{1011020002021} is an apocalyptic number.

It is an amenable number.

1011020002021 is a deficient number, since it is larger than the sum of its proper divisors (19447451).

1011020002021 is an equidigital number, since it uses as much as digits as its factorization.

1011020002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19447450.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1011020002021 its reverse (1202000201101), we get a palindrome (2213020203122).

The spelling of 1011020002021 in words is "one trillion, eleven billion, twenty million, two thousand, twenty-one".