1021012211011 has 4 divisors (see below), whose sum is σ = 1099551611872. Its totient is φ = 942472810152.

The previous prime is 1021012210931. The next prime is 1021012211077. The reversal of 1021012211011 is 1101122101201.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1021012211011 - 2¹¹ = 1021012208963 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 78539400847 = 1021012211011 / (1 + 0 + 2 + 1 + 0 + 1 + 2 + 2 + 1 + 1 + 0 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021012210982 and 1021012211000.

It is not an unprimeable number, because it can be changed into a prime (1021012211411) 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, 39269700411 + ... + 39269700436.

It is an arithmetic number, because the mean of its divisors is an integer number (274887902968).

Almost surely, 2^{1021012211011} is an apocalyptic number.

1021012211011 is a deficient number, since it is larger than the sum of its proper divisors (78539400861).

1021012211011 is an equidigital number, since it uses as much as digits as its factorization.

1021012211011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78539400860.

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

Adding to 1021012211011 its reverse (1101122101201), we get a palindrome (2122134312212).

The spelling of 1021012211011 in words is "one trillion, twenty-one billion, twelve million, two hundred eleven thousand, eleven".