211021042 has 4 divisors (see below), whose sum is σ = 316531566. Its totient is φ = 105510520.

The previous prime is 211021039. The next prime is 211021073. The reversal of 211021042 is 240120112.

It is a happy number.

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., 181198521 + 29822521 = 13461^2 + 5461^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52755259 + ... + 52755262.

Almost surely, 2^211021042 is an apocalyptic number.

211021042 is a deficient number, since it is larger than the sum of its proper divisors (105510524).

211021042 is a wasteful number, since it uses less digits than its factorization.

211021042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105510523.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 211021042 is about 14526.5633237872. The cubic root of 211021042 is about 595.3539705800.

Adding to 211021042 its reverse (240120112), we get a palindrome (451141154).

The spelling of 211021042 in words is "two hundred eleven million, twenty-one thousand, forty-two".