21550232342 has 48 divisors (see below), whose sum is σ = 35399334960. Its totient is φ = 9831585792.

The previous prime is 21550232339. The next prime is 21550232357. The reversal of 21550232342 is 24323205512.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 3401834 + ... + 3408162.

It is an arithmetic number, because the mean of its divisors is an integer number (737486145).

Almost surely, 2^21550232342 is an apocalyptic number.

21550232342 is a deficient number, since it is larger than the sum of its proper divisors (13849102618).

21550232342 is a wasteful number, since it uses less digits than its factorization.

21550232342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6545 (or 6528 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 29.

Adding to 21550232342 its reverse (24323205512), we get a palindrome (45873437854).

The spelling of 21550232342 in words is "twenty-one billion, five hundred fifty million, two hundred thirty-two thousand, three hundred forty-two".