221001020111213 has 4 divisors (see below), whose sum is σ = 221116545999228. Its totient is φ = 220885494223200.

The previous prime is 221001020111161. The next prime is 221001020111317. The reversal of 221001020111213 is 312111020100122.

It is a happy number.

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 205339356330889 + 15661663780324 = 14329667^2 + 3957482^2 .

It is a cyclic number.

It is not a de Polignac number, because 221001020111213 - 2¹⁸ = 221001019849069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221001020111191 and 221001020111200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001020111413) 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, 57762941138 + ... + 57762944963.

It is an arithmetic number, because the mean of its divisors is an integer number (55279136499807).

Almost surely, 2^{221001020111213} is an apocalyptic number.

It is an amenable number.

221001020111213 is a deficient number, since it is larger than the sum of its proper divisors (115525888015).

221001020111213 is a wasteful number, since it uses less digits than its factorization.

221001020111213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115525888014.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 221001020111213 its reverse (312111020100122), we get a palindrome (533112040211335).

The spelling of 221001020111213 in words is "two hundred twenty-one trillion, one billion, twenty million, one hundred eleven thousand, two hundred thirteen".