1021020120111 has 4 divisors (see below), whose sum is σ = 1361360160152. Its totient is φ = 680680080072.

The previous prime is 1021020120101. The next prime is 1021020120143. The reversal of 1021020120111 is 1110210201201.

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

It is not a de Polignac number, because 1021020120111 - 2¹⁵ = 1021020087343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021020120101) 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, 170170020016 + ... + 170170020021.

It is an arithmetic number, because the mean of its divisors is an integer number (340340040038).

Almost surely, 2^{1021020120111} is an apocalyptic number.

1021020120111 is a deficient number, since it is larger than the sum of its proper divisors (340340040041).

1021020120111 is an equidigital number, since it uses as much as digits as its factorization.

1021020120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340340040040.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1021020120111 its reverse (1110210201201), we get a palindrome (2131230321312).

It can be divided in two parts, 10210201201 and 11, that multiplied together give a palindrome (112312213211).

The spelling of 1021020120111 in words is "one trillion, twenty-one billion, twenty million, one hundred twenty thousand, one hundred eleven".