211402123 has 4 divisors (see below), whose sum is σ = 223837560. Its totient is φ = 198966688.

The previous prime is 211402111. The next prime is 211402159. The reversal of 211402123 is 321204112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211402123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211402097 and 211402106.

It is not an unprimeable number, because it can be changed into a prime (211402823) 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, 6217693 + ... + 6217726.

It is an arithmetic number, because the mean of its divisors is an integer number (55959390).

Almost surely, 2^211402123 is an apocalyptic number.

211402123 is a deficient number, since it is larger than the sum of its proper divisors (12435437).

211402123 is a wasteful number, since it uses less digits than its factorization.

211402123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12435436.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 211402123 is about 14539.6741022624. The cubic root of 211402123 is about 595.7121365221.

Adding to 211402123 its reverse (321204112), we get a palindrome (532606235).

The spelling of 211402123 in words is "two hundred eleven million, four hundred two thousand, one hundred twenty-three".