1021012020111 has 4 divisors (see below), whose sum is σ = 1361349360152. Its totient is φ = 680674680072.

The previous prime is 1021012020107. The next prime is 1021012020113. The reversal of 1021012020111 is 1110202101201.

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

It is not a de Polignac number, because 1021012020111 - 2² = 1021012020107 is a prime.

It is a super-2 number, since 2×1021012020111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021012020113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170168670016 + ... + 170168670021.

It is an arithmetic number, because the mean of its divisors is an integer number (340337340038).

Almost surely, 2^{1021012020111} is an apocalyptic number.

1021012020111 is a deficient number, since it is larger than the sum of its proper divisors (340337340041).

1021012020111 is an equidigital number, since it uses as much as digits as its factorization.

1021012020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340337340040.

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

Adding to 1021012020111 its reverse (1110202101201), we get a palindrome (2131214121312).

It can be divided in two parts, 102101 and 2020111, that added together give a palindrome (2122212).

The spelling of 1021012020111 in words is "one trillion, twenty-one billion, twelve million, twenty thousand, one hundred eleven".