213122011 has 4 divisors (see below), whose sum is σ = 214429672. Its totient is φ = 211814352.

The previous prime is 213121991. The next prime is 213122029. The reversal of 213122011 is 110221312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213122011 - 2¹⁵ = 213089243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213121982 and 213122000.

It is not an unprimeable number, because it can be changed into a prime (213122311) 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, 653586 + ... + 653911.

It is an arithmetic number, because the mean of its divisors is an integer number (53607418).

Almost surely, 2^213122011 is an apocalyptic number.

213122011 is a deficient number, since it is larger than the sum of its proper divisors (1307661).

213122011 is a wasteful number, since it uses less digits than its factorization.

213122011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307660.

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

The square root of 213122011 is about 14598.6989488790. The cubic root of 213122011 is about 597.3232716706.

Adding to 213122011 its reverse (110221312), we get a palindrome (323343323).

It can be divided in two parts, 2131 and 22011, that added together give a palindrome (24142).

The spelling of 213122011 in words is "two hundred thirteen million, one hundred twenty-two thousand, eleven".