21023321242 has 32 divisors (see below), whose sum is σ = 39323105280. Its totient is φ = 8189495280.

The previous prime is 21023321237. The next prime is 21023321273. The reversal of 21023321242 is 24212332012.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1620859 + ... + 1633777.

It is an arithmetic number, because the mean of its divisors is an integer number (1228847040).

Almost surely, 2^21023321242 is an apocalyptic number.

21023321242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21023321242 is a deficient number, since it is larger than the sum of its proper divisors (18299784038).

21023321242 is a wasteful number, since it uses less digits than its factorization.

21023321242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23506.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21023321242 its reverse (24212332012), we get a palindrome (45235653254).

The spelling of 21023321242 in words is "twenty-one billion, twenty-three million, three hundred twenty-one thousand, two hundred forty-two".