1011012220021 has 4 divisors (see below), whose sum is σ = 1011990935692. Its totient is φ = 1010033504352.

The previous prime is 1011012220007. The next prime is 1011012220027. The reversal of 1011012220021 is 1200222101101.

1011012220021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 458092080625 + 552920139396 = 676825^2 + 743586^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011012220021 - 2²¹ = 1011010122869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011012219983 and 1011012220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011012220027) 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, 489356286 + ... + 489358351.

It is an arithmetic number, because the mean of its divisors is an integer number (252997733923).

Almost surely, 2^{1011012220021} is an apocalyptic number.

It is an amenable number.

1011012220021 is a deficient number, since it is larger than the sum of its proper divisors (978715671).

1011012220021 is an equidigital number, since it uses as much as digits as its factorization.

1011012220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978715670.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1011012220021 its reverse (1200222101101), we get a palindrome (2211234321122).

The spelling of 1011012220021 in words is "one trillion, eleven billion, twelve million, two hundred twenty thousand, twenty-one".