21222001042242 has 128 divisors (see below), whose sum is σ = 58826066116608. Its totient is φ = 4924056787200.

The previous prime is 21222001042219. The next prime is 21222001042261. The reversal of 21222001042242 is 24224010022212.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 56805213 + ... + 57177584.

It is an arithmetic number, because the mean of its divisors is an integer number (459578641536).

Almost surely, 2^{21222001042242} is an apocalyptic number.

21222001042242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21222001042242 is an abundant number, since it is smaller than the sum of its proper divisors (37604065074366).

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

21222001042242 is a wasteful number, since it uses less digits than its factorization.

21222001042242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113982864.

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 21222001042242 its reverse (24224010022212), we get a palindrome (45446011064454).

The spelling of 21222001042242 in words is "twenty-one trillion, two hundred twenty-two billion, one million, forty-two thousand, two hundred forty-two".