1021021021111 has 32 divisors (see below), whose sum is σ = 1286613135360. Its totient is φ = 788659825536.

The previous prime is 1021021021081. The next prime is 1021021021123. The reversal of 1021021021111 is 1111201201201.

It is a happy number.

It is not a de Polignac number, because 1021021021111 - 2¹⁹ = 1021020496823 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 1021021021091 and 1021021021100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021021021171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1397310 + ... + 1998628.

It is an arithmetic number, because the mean of its divisors is an integer number (40206660480).

Almost surely, 2^{1021021021111} is an apocalyptic number.

1021021021111 is a deficient number, since it is larger than the sum of its proper divisors (265592114249).

1021021021111 is a wasteful number, since it uses less digits than its factorization.

1021021021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601783.

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

Adding to 1021021021111 its reverse (1111201201201), we get a palindrome (2132222222312).

The spelling of 1021021021111 in words is "one trillion, twenty-one billion, twenty-one million, twenty-one thousand, one hundred eleven".