21001420322342 has 4 divisors (see below), whose sum is σ = 31502130483516. Its totient is φ = 10500710161170.

The previous prime is 21001420322321. The next prime is 21001420322347. The reversal of 21001420322342 is 24322302410012.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001420322347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250355080584 + ... + 5250355080587.

It is an arithmetic number, because the mean of its divisors is an integer number (7875532620879).

Almost surely, 2^{21001420322342} is an apocalyptic number.

21001420322342 is a deficient number, since it is larger than the sum of its proper divisors (10500710161174).

21001420322342 is a wasteful number, since it uses less digits than its factorization.

21001420322342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10500710161173.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21001420322342 its reverse (24322302410012), we get a palindrome (45323722732354).

The spelling of 21001420322342 in words is "twenty-one trillion, one billion, four hundred twenty million, three hundred twenty-two thousand, three hundred forty-two".