1011011012021 has 4 divisors (see below), whose sum is σ = 1015425907500. Its totient is φ = 1006596116544.

The previous prime is 1011011011993. The next prime is 1011011012047. The reversal of 1011011012021 is 1202101101101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 520149633796 + 490861378225 = 721214^2 + 700615^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011011012021 - 2¹⁴ = 1011010995637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011011011993 and 1011011012011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011011012071) 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, 2207447396 + ... + 2207447853.

It is an arithmetic number, because the mean of its divisors is an integer number (253856476875).

Almost surely, 2^{1011011012021} is an apocalyptic number.

It is an amenable number.

1011011012021 is a deficient number, since it is larger than the sum of its proper divisors (4414895479).

1011011012021 is an equidigital number, since it uses as much as digits as its factorization.

1011011012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4414895478.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1011011012021 its reverse (1202101101101), we get a palindrome (2213112113122).

The spelling of 1011011012021 in words is "one trillion, eleven billion, eleven million, twelve thousand, twenty-one".