21422213542 has 4 divisors (see below), whose sum is σ = 32133320316. Its totient is φ = 10711106770.

The previous prime is 21422213531. The next prime is 21422213647. The reversal of 21422213542 is 24531222412.

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

It is a super-2 number, since 2×21422213542² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21422213542.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5355553384 + ... + 5355553387.

It is an arithmetic number, because the mean of its divisors is an integer number (8033330079).

Almost surely, 2^21422213542 is an apocalyptic number.

21422213542 is a deficient number, since it is larger than the sum of its proper divisors (10711106774).

21422213542 is a wasteful number, since it uses less digits than its factorization.

21422213542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10711106773.

The product of its digits is 7680, while the sum is 28.

Adding to 21422213542 its reverse (24531222412), we get a palindrome (45953435954).

The spelling of 21422213542 in words is "twenty-one billion, four hundred twenty-two million, two hundred thirteen thousand, five hundred forty-two".