213011123201021 has 4 divisors (see below), whose sum is σ = 213024868530012. Its totient is φ = 212997377872032.

The previous prime is 213011123200991. The next prime is 213011123201039. The reversal of 213011123201021 is 120102321110312.

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 131506537816900 + 81504585384121 = 11467630^2 + 9027989^2 .

It is a cyclic number.

It is not a de Polignac number, because 213011123201021 - 2²² = 213011119006717 is a prime.

It is a super-3 number, since 3×213011123201021³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213011123200984 and 213011123201002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213011123201221) 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, 6872641250 + ... + 6872672243.

It is an arithmetic number, because the mean of its divisors is an integer number (53256217132503).

Almost surely, 2^{213011123201021} is an apocalyptic number.

It is an amenable number.

213011123201021 is a deficient number, since it is larger than the sum of its proper divisors (13745328991).

213011123201021 is a wasteful number, since it uses less digits than its factorization.

213011123201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13745328990.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 213011123201021 its reverse (120102321110312), we get a palindrome (333113444311333).

The spelling of 213011123201021 in words is "two hundred thirteen trillion, eleven billion, one hundred twenty-three million, two hundred one thousand, twenty-one".