21223624542 has 16 divisors (see below), whose sum is σ = 42486969360. Its totient is φ = 7067921472.

The previous prime is 21223624489. The next prime is 21223624547. The reversal of 21223624542 is 24542632212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223624547) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 1648063 + ... + 1660890.

It is an arithmetic number, because the mean of its divisors is an integer number (2655435585).

Almost surely, 2^21223624542 is an apocalyptic number.

21223624542 is an abundant number, since it is smaller than the sum of its proper divisors (21263344818).

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

21223624542 is a wasteful number, since it uses less digits than its factorization.

21223624542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3310027.

The product of its digits is 46080, while the sum is 33.

The spelling of 21223624542 in words is "twenty-one billion, two hundred twenty-three million, six hundred twenty-four thousand, five hundred forty-two".