213510121 has 4 divisors (see below), whose sum is σ = 232920144. Its totient is φ = 194100100.

The previous prime is 213510119. The next prime is 213510131. The reversal of 213510121 is 121015312.

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 213510121 - 2¹ = 213510119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213510095 and 213510104.

It is not an unprimeable number, because it can be changed into a prime (213510131) 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, 9704995 + ... + 9705016.

It is an arithmetic number, because the mean of its divisors is an integer number (58230036).

Almost surely, 2^213510121 is an apocalyptic number.

It is an amenable number.

213510121 is a deficient number, since it is larger than the sum of its proper divisors (19410023).

213510121 is a wasteful number, since it uses less digits than its factorization.

213510121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19410022.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 213510121 is about 14611.9855255882. The cubic root of 213510121 is about 597.6856408625.

Adding to 213510121 its reverse (121015312), we get a palindrome (334525433).

The spelling of 213510121 in words is "two hundred thirteen million, five hundred ten thousand, one hundred twenty-one".