211421011 has 4 divisors (see below), whose sum is σ = 211626712. Its totient is φ = 211215312.

The previous prime is 211421009. The next prime is 211421033. The reversal of 211421011 is 110124112.

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 211421011 - 2¹ = 211421009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211420982 and 211421000.

It is not an unprimeable number, because it can be changed into a prime (211421711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101301 + ... + 103366.

It is an arithmetic number, because the mean of its divisors is an integer number (52906678).

Almost surely, 2^211421011 is an apocalyptic number.

211421011 is a deficient number, since it is larger than the sum of its proper divisors (205701).

211421011 is a wasteful number, since it uses less digits than its factorization.

211421011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205700.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 211421011 is about 14540.3236208827. The cubic root of 211421011 is about 595.7298775546.

Adding to 211421011 its reverse (110124112), we get a palindrome (321545123).

The spelling of 211421011 in words is "two hundred eleven million, four hundred twenty-one thousand, eleven".