21402304442 has 16 divisors (see below), whose sum is σ = 33219849600. Its totient is φ = 10329229680.

The previous prime is 21402304409. The next prime is 21402304481. The reversal of 21402304442 is 24440320412.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162659 + ... + 263177.

It is an arithmetic number, because the mean of its divisors is an integer number (2076240600).

Almost surely, 2^21402304442 is an apocalyptic number.

21402304442 is a deficient number, since it is larger than the sum of its proper divisors (11817545158).

21402304442 is a wasteful number, since it uses less digits than its factorization.

21402304442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104221.

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 21402304442 its reverse (24440320412), we get a palindrome (45842624854).

The spelling of 21402304442 in words is "twenty-one billion, four hundred two million, three hundred four thousand, four hundred forty-two".