1021001011011 has 6 divisors (see below), whose sum is σ = 1474779238140. Its totient is φ = 680667340668.

The previous prime is 1021001010941. The next prime is 1021001011013. The reversal of 1021001011011 is 1101101001201.

It is not a de Polignac number, because 1021001011011 - 2²¹ = 1020998913859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 113444556779 = 1021001011011 / (1 + 0 + 2 + 1 + 0 + 0 + 1 + 0 + 1 + 1 + 0 + 1 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 1021001010984 and 1021001011002.

It is not an unprimeable number, because it can be changed into a prime (1021001011013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56722278381 + ... + 56722278398.

It is an arithmetic number, because the mean of its divisors is an integer number (245796539690).

Almost surely, 2^{1021001011011} is an apocalyptic number.

1021001011011 is a deficient number, since it is larger than the sum of its proper divisors (453778227129).

1021001011011 is a wasteful number, since it uses less digits than its factorization.

1021001011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113444556785 (or 113444556782 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 1021001011011 its reverse (1101101001201), we get a palindrome (2122102012212).

It can be divided in two parts, 102100 and 1011011, that added together give a palindrome (1113111).

The spelling of 1021001011011 in words is "one trillion, twenty-one billion, one million, eleven thousand, eleven".