21203221342 has 32 divisors (see below), whose sum is σ = 34588800000. Its totient is φ = 9711187200.

The previous prime is 21203221339. The next prime is 21203221357. The reversal of 21203221342 is 24312230212.

It is a congruent number.

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, 1464117 + ... + 1478527.

It is an arithmetic number, because the mean of its divisors is an integer number (1080900000).

Almost surely, 2^21203221342 is an apocalyptic number.

21203221342 is a deficient number, since it is larger than the sum of its proper divisors (13385578658).

21203221342 is a wasteful number, since it uses less digits than its factorization.

21203221342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15712.

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

Adding to 21203221342 its reverse (24312230212), we get a palindrome (45515451554).

The spelling of 21203221342 in words is "twenty-one billion, two hundred three million, two hundred twenty-one thousand, three hundred forty-two".