211216642 has 32 divisors (see below), whose sum is σ = 390789504. Its totient is φ = 83376000.

The previous prime is 211216639. The next prime is 211216651. The reversal of 211216642 is 246612112.

It is a happy number.

It is a super-2 number, since 2×211216642² = 89224939715512328, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108417 + ... + 110347.

It is an arithmetic number, because the mean of its divisors is an integer number (12212172).

Almost surely, 2^211216642 is an apocalyptic number.

211216642 is a deficient number, since it is larger than the sum of its proper divisors (179572862).

211216642 is a wasteful number, since it uses less digits than its factorization.

211216642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554.

The product of its digits is 1152, while the sum is 25.

The square root of 211216642 is about 14533.2942583573. The cubic root of 211216642 is about 595.5378626280.

Adding to 211216642 its reverse (246612112), we get a palindrome (457828754).

The spelling of 211216642 in words is "two hundred eleven million, two hundred sixteen thousand, six hundred forty-two".