101020111121221 has 4 divisors (see below), whose sum is σ = 101020571986444. Its totient is φ = 101019650256000.

The previous prime is 101020111121213. The next prime is 101020111121309. The reversal of 101020111121221 is 122121111020101.

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

It can be written as a sum of positive squares in 2 ways, for example, as 39190417050625 + 61829694070596 = 6260225^2 + 7863186^2 .

It is a cyclic number.

It is not a de Polignac number, because 101020111121221 - 2³ = 101020111121213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101020111121195 and 101020111121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101020111121201) 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, 230103660 + ... + 230542261.

It is an arithmetic number, because the mean of its divisors is an integer number (25255142996611).

Almost surely, 2^{101020111121221} is an apocalyptic number.

It is an amenable number.

101020111121221 is a deficient number, since it is larger than the sum of its proper divisors (460865223).

101020111121221 is an equidigital number, since it uses as much as digits as its factorization.

101020111121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460865222.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 101020111121221 its reverse (122121111020101), we get a palindrome (223141222141322).

The spelling of 101020111121221 in words is "one hundred one trillion, twenty billion, one hundred eleven million, one hundred twenty-one thousand, two hundred twenty-one".