21201240022 has 32 divisors (see below), whose sum is σ = 35483482080. Its totient is φ = 9441630720.

The previous prime is 21201239993. The next prime is 21201240029. The reversal of 21201240022 is 22004210212.

It is a junction number, because it is equal to n+sod(n) for n = 21201239978 and 21201240005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201240029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 590448 + ... + 625324.

It is an arithmetic number, because the mean of its divisors is an integer number (1108858815).

Almost surely, 2^21201240022 is an apocalyptic number.

21201240022 is a deficient number, since it is larger than the sum of its proper divisors (14282242058).

21201240022 is a wasteful number, since it uses less digits than its factorization.

21201240022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35856.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21201240022 its reverse (22004210212), we get a palindrome (43205450234).

The spelling of 21201240022 in words is "twenty-one billion, two hundred one million, two hundred forty thousand, twenty-two".