213101401221421 has 8 divisors (see below), whose sum is σ = 220450252897080. Its totient is φ = 205752584712192.

The previous prime is 213101401221389. The next prime is 213101401221427. The reversal of 213101401221421 is 124122104101312.

It can be written as a sum of positive squares in 4 ways, for example, as 134994886812900 + 78106514408521 = 11618730^2 + 8837789^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213101401221421 - 2⁵ = 213101401221389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213101401221427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3844821 + ... + 20999653.

It is an arithmetic number, because the mean of its divisors is an integer number (27556281612135).

Almost surely, 2^{213101401221421} is an apocalyptic number.

It is an amenable number.

213101401221421 is a deficient number, since it is larger than the sum of its proper divisors (7348851675659).

213101401221421 is a wasteful number, since it uses less digits than its factorization.

213101401221421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17583215.

The product of its (nonzero) digits is 768, while the sum is 25.

Adding to 213101401221421 its reverse (124122104101312), we get a palindrome (337223505322733).

The spelling of 213101401221421 in words is "two hundred thirteen trillion, one hundred one billion, four hundred one million, two hundred twenty-one thousand, four hundred twenty-one".