1011201111021 has 4 divisors (see below), whose sum is σ = 1348268148032. Its totient is φ = 674134074012.

The previous prime is 1011201110993. The next prime is 1011201111047. The reversal of 1011201111021 is 1201111021101.

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 not a de Polignac number, because 1011201111021 - 2⁹ = 1011201110509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011201110988 and 1011201111006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011201111061) 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, 168533518501 + ... + 168533518506.

It is an arithmetic number, because the mean of its divisors is an integer number (337067037008).

Almost surely, 2^{1011201111021} is an apocalyptic number.

It is an amenable number.

1011201111021 is a deficient number, since it is larger than the sum of its proper divisors (337067037011).

1011201111021 is an equidigital number, since it uses as much as digits as its factorization.

1011201111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337067037010.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 1011201111021 its reverse (1201111021101), we get a palindrome (2212312132122).

It can be divided in two parts, 101 and 1201111021, that multiplied together give a palindrome (121312213121).

The spelling of 1011201111021 in words is "one trillion, eleven billion, two hundred one million, one hundred eleven thousand, twenty-one".