213606121 has 4 divisors (see below), whose sum is σ = 214916752. Its totient is φ = 212295492.

The previous prime is 213606119. The next prime is 213606131. The reversal of 213606121 is 121606312.

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 213606121 - 2¹ = 213606119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213606092 and 213606101.

It is not an unprimeable number, because it can be changed into a prime (213606131) 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, 655071 + ... + 655396.

It is an arithmetic number, because the mean of its divisors is an integer number (53729188).

Almost surely, 2^213606121 is an apocalyptic number.

It is an amenable number.

213606121 is a deficient number, since it is larger than the sum of its proper divisors (1310631).

213606121 is a wasteful number, since it uses less digits than its factorization.

213606121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310630.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 213606121 is about 14615.2701309281. The cubic root of 213606121 is about 597.7752060532.

The spelling of 213606121 in words is "two hundred thirteen million, six hundred six thousand, one hundred twenty-one".