21222100542 has 8 divisors (see below), whose sum is σ = 42444201096. Its totient is φ = 7074033512.

The previous prime is 21222100531. The next prime is 21222100567. The reversal of 21222100542 is 24500122212.

It is a sphenic number, since it is the product of 3 distinct primes.

21222100542 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1768508373 + ... + 1768508384.

It is an arithmetic number, because the mean of its divisors is an integer number (5305525137).

Almost surely, 2^21222100542 is an apocalyptic number.

21222100542 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21222100542 is a wasteful number, since it uses less digits than its factorization.

21222100542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3537016762.

The product of its (nonzero) digits is 640, while the sum is 21.

Adding to 21222100542 its reverse (24500122212), we get a palindrome (45722222754).

The spelling of 21222100542 in words is "twenty-one billion, two hundred twenty-two million, one hundred thousand, five hundred forty-two".