213102020101 has 4 divisors (see below), whose sum is σ = 213147981612. Its totient is φ = 213056058592.

The previous prime is 213102020081. The next prime is 213102020107. The reversal of 213102020101 is 101020201312.

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 123623263201 + 89478756900 = 351601^2 + 299130^2 .

It is a cyclic number.

It is not a de Polignac number, because 213102020101 - 2²⁷ = 212967802373 is a prime.

It is a super-2 number, since 2×213102020101² (a number of 23 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 (213102020107) 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, 22973800 + ... + 22983073.

It is an arithmetic number, because the mean of its divisors is an integer number (53286995403).

Almost surely, 2^213102020101 is an apocalyptic number.

It is an amenable number.

213102020101 is a deficient number, since it is larger than the sum of its proper divisors (45961511).

213102020101 is an equidigital number, since it uses as much as digits as its factorization.

213102020101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45961510.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 213102020101 its reverse (101020201312), we get a palindrome (314122221413).

The spelling of 213102020101 in words is "two hundred thirteen billion, one hundred two million, twenty thousand, one hundred one".