213021101223121 has 4 divisors (see below), whose sum is σ = 213029374876912. Its totient is φ = 213012827569332.

The previous prime is 213021101223059. The next prime is 213021101223137. The reversal of 213021101223121 is 121322101120312.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 213021101223121 - 2²¹ = 213021099125969 is a prime.

It is a super-2 number, since 2×213021101223121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213021101223092 and 213021101223101.

It is not an unprimeable number, because it can be changed into a prime (213021101224121) 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, 4136788275 + ... + 4136839768.

It is an arithmetic number, because the mean of its divisors is an integer number (53257343719228).

Almost surely, 2^{213021101223121} is an apocalyptic number.

It is an amenable number.

213021101223121 is a deficient number, since it is larger than the sum of its proper divisors (8273653791).

213021101223121 is an equidigital number, since it uses as much as digits as its factorization.

213021101223121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8273653790.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 213021101223121 its reverse (121322101120312), we get a palindrome (334343202343433).

The spelling of 213021101223121 in words is "two hundred thirteen trillion, twenty-one billion, one hundred one million, two hundred twenty-three thousand, one hundred twenty-one".