211221043442 has 16 divisors (see below), whose sum is σ = 319764192000. Its totient is φ = 104633136720.

The previous prime is 211221043433. The next prime is 211221043463. The reversal of 211221043442 is 244340122112.

It is a super-2 number, since 2×211221043442² (a number of 23 digits) contains 22 as substring.

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, 3310559 + ... + 3373757.

It is an arithmetic number, because the mean of its divisors is an integer number (19985262000).

Almost surely, 2^211221043442 is an apocalyptic number.

211221043442 is a deficient number, since it is larger than the sum of its proper divisors (108543148558).

211221043442 is a wasteful number, since it uses less digits than its factorization.

211221043442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78641.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 211221043442 its reverse (244340122112), we get a palindrome (455561165554).

The spelling of 211221043442 in words is "two hundred eleven billion, two hundred twenty-one million, forty-three thousand, four hundred forty-two".