1021000221011 has 4 divisors (see below), whose sum is σ = 1065391534992. Its totient is φ = 976608907032.

The previous prime is 1021000220957. The next prime is 1021000221029. The reversal of 1021000221011 is 1101220001201.

1021000221011 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021000221011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021000220983 and 1021000221001.

It is not an unprimeable number, because it can be changed into a prime (1021000221071) 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, 22195656956 + ... + 22195657001.

It is an arithmetic number, because the mean of its divisors is an integer number (266347883748).

Almost surely, 2^{1021000221011} is an apocalyptic number.

1021000221011 is a deficient number, since it is larger than the sum of its proper divisors (44391313981).

1021000221011 is an equidigital number, since it uses as much as digits as its factorization.

1021000221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44391313980.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1021000221011 its reverse (1101220001201), we get a palindrome (2122220222212).

The spelling of 1021000221011 in words is "one trillion, twenty-one billion, two hundred twenty-one thousand, eleven".