211213121 has 8 divisors (see below), whose sum is σ = 241548480. Its totient is φ = 180918288.

The previous prime is 211213103. The next prime is 211213147. The reversal of 211213121 is 121312112.

211213121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211213121 is a prime.

It is a super-2 number, since 2×211213121² = 89221964965121282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211213096 and 211213105.

It is not an unprimeable number, because it can be changed into a prime (211213021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2015 + ... + 20651.

It is an arithmetic number, because the mean of its divisors is an integer number (30193560).

Almost surely, 2^211213121 is an apocalyptic number.

It is an amenable number.

211213121 is a deficient number, since it is larger than the sum of its proper divisors (30335359).

211213121 is a wasteful number, since it uses less digits than its factorization.

211213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20263.

The product of its digits is 24, while the sum is 14.

The square root of 211213121 is about 14533.1731222056. The cubic root of 211213121 is about 595.5345533868.

Adding to 211213121 its reverse (121312112), we get a palindrome (332525233).

It can be divided in two parts, 21121 and 3121, that added together give a palindrome (24242).

The spelling of 211213121 in words is "two hundred eleven million, two hundred thirteen thousand, one hundred twenty-one".