213121313021101 has 4 divisors (see below), whose sum is σ = 213168536892892. Its totient is φ = 213074089149312.

The previous prime is 213121313021077. The next prime is 213121313021117. The reversal of 213121313021101 is 101120313121312.

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 9010773222025 + 204110539799076 = 3001795^2 + 14286726^2 .

It is a cyclic number.

It is not a de Polignac number, because 213121313021101 - 2⁹ = 213121313020589 is a prime.

It is a super-2 number, since 2×213121313021101² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213121313021501) 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, 23611929126 + ... + 23611938151.

It is an arithmetic number, because the mean of its divisors is an integer number (53292134223223).

Almost surely, 2^{213121313021101} is an apocalyptic number.

It is an amenable number.

213121313021101 is a deficient number, since it is larger than the sum of its proper divisors (47223871791).

213121313021101 is an equidigital number, since it uses as much as digits as its factorization.

213121313021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47223871790.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 213121313021101 its reverse (101120313121312), we get a palindrome (314241626142413).

The spelling of 213121313021101 in words is "two hundred thirteen trillion, one hundred twenty-one billion, three hundred thirteen million, twenty-one thousand, one hundred one".