21320442402 has 32 divisors (see below), whose sum is σ = 48741512832. Its totient is φ = 6090420864.

The previous prime is 21320442371. The next prime is 21320442413. The reversal of 21320442402 is 20424402312.

It is a super-2 number, since 2×21320442402² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195718 + ... + 284510.

It is an arithmetic number, because the mean of its divisors is an integer number (1523172276).

Almost surely, 2^21320442402 is an apocalyptic number.

21320442402 is an abundant number, since it is smaller than the sum of its proper divisors (27421070430).

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

21320442402 is a wasteful number, since it uses less digits than its factorization.

21320442402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94522.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21320442402 its reverse (20424402312), we get a palindrome (41744844714).

The spelling of 21320442402 in words is "twenty-one billion, three hundred twenty million, four hundred forty-two thousand, four hundred two".