1011221201021 has 8 divisors (see below), whose sum is σ = 1013183432280. Its totient is φ = 1009260871488.

The previous prime is 1011221200981. The next prime is 1011221201051. The reversal of 1011221201021 is 1201021221101.

It can be written as a sum of positive squares in 4 ways, for example, as 678045199225 + 333176001796 = 823435^2 + 577214^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011221201021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011221200987 and 1011221201005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011221201051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 591395 + ... + 1540191.

It is an arithmetic number, because the mean of its divisors is an integer number (126647929035).

Almost surely, 2^{1011221201021} is an apocalyptic number.

It is an amenable number.

1011221201021 is a deficient number, since it is larger than the sum of its proper divisors (1962231259).

1011221201021 is an equidigital number, since it uses as much as digits as its factorization.

1011221201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950863.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1011221201021 its reverse (1201021221101), we get a palindrome (2212242422122).

The spelling of 1011221201021 in words is "one trillion, eleven billion, two hundred twenty-one million, two hundred one thousand, twenty-one".