22121021142 has 24 divisors (see below), whose sum is σ = 52286050440. Its totient is φ = 6703339680.

The previous prime is 22121021119. The next prime is 22121021177. The reversal of 22121021142 is 24112012122.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55860967 + ... + 55861362.

It is an arithmetic number, because the mean of its divisors is an integer number (2178585435).

Almost surely, 2^22121021142 is an apocalyptic number.

22121021142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

22121021142 is an abundant number, since it is smaller than the sum of its proper divisors (30165029298).

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

22121021142 is a wasteful number, since it uses less digits than its factorization.

22121021142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111722348 (or 111722345 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 22121021142 its reverse (24112012122), we get a palindrome (46233033264).

The spelling of 22121021142 in words is "twenty-two billion, one hundred twenty-one million, twenty-one thousand, one hundred forty-two".