1011002121021 has 4 divisors (see below), whose sum is σ = 1348002828032. Its totient is φ = 674001414012.

The previous prime is 1011002120927. The next prime is 1011002121029. The reversal of 1011002121021 is 1201212001101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-1011002121021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011002120988 and 1011002121006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011002121029) 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, 168500353501 + ... + 168500353506.

It is an arithmetic number, because the mean of its divisors is an integer number (337000707008).

Almost surely, 2^{1011002121021} is an apocalyptic number.

It is an amenable number.

1011002121021 is a deficient number, since it is larger than the sum of its proper divisors (337000707011).

1011002121021 is an equidigital number, since it uses as much as digits as its factorization.

1011002121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337000707010.

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

Adding to 1011002121021 its reverse (1201212001101), we get a palindrome (2212214122122).

The spelling of 1011002121021 in words is "one trillion, eleven billion, two million, one hundred twenty-one thousand, twenty-one".