1011211012021 has 12 divisors (see below), whose sum is σ = 1198501156332. Its totient is φ = 850398476928.

The previous prime is 1011211012003. The next prime is 1011211012027. The reversal of 1011211012021 is 1202101121101.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 424010647921 + 587200364100 = 651161^2 + 766290^2 .

It is not a de Polignac number, because 1011211012021 - 2⁷ = 1011211011893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011211011992 and 1011211012010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011211012027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 194685700 + ... + 194690893.

It is an arithmetic number, because the mean of its divisors is an integer number (99875096361).

Almost surely, 2^{1011211012021} is an apocalyptic number.

It is an amenable number.

1011211012021 is a deficient number, since it is larger than the sum of its proper divisors (187290144311).

1011211012021 is an equidigital number, since it uses as much as digits as its factorization.

1011211012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389376660 (or 389376653 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1011211012021 its reverse (1202101121101), we get a palindrome (2213312133122).

The spelling of 1011211012021 in words is "one trillion, eleven billion, two hundred eleven million, twelve thousand, twenty-one".