1011101220021 has 4 divisors (see below), whose sum is σ = 1348134960032. Its totient is φ = 674067480012.

The previous prime is 1011101220013. The next prime is 1011101220029. The reversal of 1011101220021 is 1200221011101.

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 an interprime number because it is at equal distance from previous prime (1011101220013) and next prime (1011101220029).

It is not a de Polignac number, because 1011101220021 - 2³ = 1011101220013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011101219979 and 1011101220006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011101220029) 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, 168516870001 + ... + 168516870006.

It is an arithmetic number, because the mean of its divisors is an integer number (337033740008).

Almost surely, 2^{1011101220021} is an apocalyptic number.

It is an amenable number.

1011101220021 is a deficient number, since it is larger than the sum of its proper divisors (337033740011).

1011101220021 is an equidigital number, since it uses as much as digits as its factorization.

1011101220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337033740010.

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

Adding to 1011101220021 its reverse (1200221011101), we get a palindrome (2211322231122).

The spelling of 1011101220021 in words is "one trillion, eleven billion, one hundred one million, two hundred twenty thousand, twenty-one".