211020442 has 4 divisors (see below), whose sum is σ = 316530666. Its totient is φ = 105510220.

The previous prime is 211020427. The next prime is 211020451. The reversal of 211020442 is 244020112.

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

It can be written as a sum of positive squares in only one way, i.e., 132503121 + 78517321 = 11511^2 + 8861^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52755109 + ... + 52755112.

Almost surely, 2^211020442 is an apocalyptic number.

211020442 is a deficient number, since it is larger than the sum of its proper divisors (105510224).

211020442 is a wasteful number, since it uses less digits than its factorization.

211020442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105510223.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 211020442 is about 14526.5426719505. The cubic root of 211020442 is about 595.3534063192.

Adding to 211020442 its reverse (244020112), we get a palindrome (455040554).

The spelling of 211020442 in words is "two hundred eleven million, twenty thousand, four hundred forty-two".