1020002121111 has 4 divisors (see below), whose sum is σ = 1360002828152. Its totient is φ = 680001414072.

The previous prime is 1020002121091. The next prime is 1020002121113. The reversal of 1020002121111 is 1111212000201.

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

It is not a de Polignac number, because 1020002121111 - 2²³ = 1019993732503 is a prime.

It is a super-2 number, since 2×1020002121111² (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 (1020002121113) 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, 170000353516 + ... + 170000353521.

It is an arithmetic number, because the mean of its divisors is an integer number (340000707038).

Almost surely, 2^{1020002121111} is an apocalyptic number.

1020002121111 is a deficient number, since it is larger than the sum of its proper divisors (340000707041).

1020002121111 is an equidigital number, since it uses as much as digits as its factorization.

1020002121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340000707040.

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

Adding to 1020002121111 its reverse (1111212000201), we get a palindrome (2131214121312).

The spelling of 1020002121111 in words is "one trillion, twenty billion, two million, one hundred twenty-one thousand, one hundred eleven".