211420242 has 48 divisors (see below), whose sum is σ = 507210912. Its totient is φ = 63106560.

The previous prime is 211420229. The next prime is 211420247. The reversal of 211420242 is 242024112.

211420242 is a `hidden beast` number, since 2 + 1 + 1 + 420 + 242 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (211420247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5298 + ... + 21234.

It is an arithmetic number, because the mean of its divisors is an integer number (10566894).

Almost surely, 2^211420242 is an apocalyptic number.

211420242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 211420242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253605456).

211420242 is an abundant number, since it is smaller than the sum of its proper divisors (295790670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211420242 is a wasteful number, since it uses less digits than its factorization.

211420242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16023 (or 16020 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 211420242 is about 14540.2971771556. The cubic root of 211420242 is about 595.7291552725.

Adding to 211420242 its reverse (242024112), we get a palindrome (453444354).

The spelling of 211420242 in words is "two hundred eleven million, four hundred twenty thousand, two hundred forty-two".