21203224042 has 96 divisors (see below), whose sum is σ = 43661963520. Its totient is φ = 7591086720.

The previous prime is 21203224037. The next prime is 21203224099. The reversal of 21203224042 is 24042230212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3205903 + ... + 3212509.

It is an arithmetic number, because the mean of its divisors is an integer number (454812120).

Almost surely, 2^21203224042 is an apocalyptic number.

21203224042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21203224042 is an abundant number, since it is smaller than the sum of its proper divisors (22458739478).

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

21203224042 is a wasteful number, since it uses less digits than its factorization.

21203224042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6876 (or 6869 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21203224042 its reverse (24042230212), we get a palindrome (45245454254).

The spelling of 21203224042 in words is "twenty-one billion, two hundred three million, two hundred twenty-four thousand, forty-two".