211240442 has 16 divisors (see below), whose sum is σ = 381186240. Its totient is φ = 85766688.

The previous prime is 211240433. The next prime is 211240451. The reversal of 211240442 is 244042112.

It is an interprime number because it is at equal distance from previous prime (211240433) and next prime (211240451).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396803 + ... + 397334.

It is an arithmetic number, because the mean of its divisors is an integer number (23824140).

Almost surely, 2^211240442 is an apocalyptic number.

211240442 is a deficient number, since it is larger than the sum of its proper divisors (169945798).

211240442 is a wasteful number, since it uses less digits than its factorization.

211240442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794165.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 211240442 is about 14534.1130448335. The cubic root of 211240442 is about 595.5602302923.

Adding to 211240442 its reverse (244042112), we get a palindrome (455282554).

The spelling of 211240442 in words is "two hundred eleven million, two hundred forty thousand, four hundred forty-two".