22001221242 has 128 divisors (see below), whose sum is σ = 65644830720. Its totient is φ = 5275005120.

The previous prime is 22001221223. The next prime is 22001221243. The reversal of 22001221242 is 24212210022.

22001221242 is a `hidden beast` number, since 2 + 200 + 1 + 221 + 242 = 666.

It is a super-2 number, since 2×22001221242² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (22001221243) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 149458 + ... + 257565.

It is an arithmetic number, because the mean of its divisors is an integer number (512850240).

Almost surely, 2^22001221242 is an apocalyptic number.

22001221242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

22001221242 is an abundant number, since it is smaller than the sum of its proper divisors (43643609478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22001221242 is a wasteful number, since it uses less digits than its factorization.

22001221242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407065 (or 407059 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 22001221242 its reverse (24212210022), we get a palindrome (46213431264).

The spelling of 22001221242 in words is "twenty-two billion, one million, two hundred twenty-one thousand, two hundred forty-two".