211221111442 has 16 divisors (see below), whose sum is σ = 351492760800. Its totient is φ = 94382314240.

The previous prime is 211221111421. The next prime is 211221111449. The reversal of 211221111442 is 244111122112.

It is a super-2 number, since 2×211221111442² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (211221111449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81362767 + ... + 81365362.

It is an arithmetic number, because the mean of its divisors is an integer number (21968297550).

Almost surely, 2^211221111442 is an apocalyptic number.

211221111442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

211221111442 is a deficient number, since it is larger than the sum of its proper divisors (140271649358).

211221111442 is a wasteful number, since it uses less digits than its factorization.

211221111442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162728201.

The product of its digits is 256, while the sum is 22.

Adding to 211221111442 its reverse (244111122112), we get a palindrome (455332233554).

The spelling of 211221111442 in words is "two hundred eleven billion, two hundred twenty-one million, one hundred eleven thousand, four hundred forty-two".