21012303442 has 16 divisors (see below), whose sum is σ = 34665144192. Its totient is φ = 9491645520.

The previous prime is 21012303439. The next prime is 21012303443. The reversal of 21012303442 is 24430321012.

It is not an unprimeable number, because it can be changed into a prime (21012303443) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 8596284 + ... + 8598727.

It is an arithmetic number, because the mean of its divisors is an integer number (2166571512).

Almost surely, 2^21012303442 is an apocalyptic number.

21012303442 is a deficient number, since it is larger than the sum of its proper divisors (13652840750).

21012303442 is a wasteful number, since it uses less digits than its factorization.

21012303442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17195073.

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

Adding to 21012303442 its reverse (24430321012), we get a palindrome (45442624454).

The spelling of 21012303442 in words is "twenty-one billion, twelve million, three hundred three thousand, four hundred forty-two".