21426930424 has 64 divisors (see below), whose sum is σ = 44232687360. Its totient is φ = 9686507520.

The previous prime is 21426930409. The next prime is 21426930431. The reversal of 21426930424 is 42403962412.

It is a super-2 number, since 2×21426930424² (a number of 21 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 559044 + ... + 596140.

It is an arithmetic number, because the mean of its divisors is an integer number (691135740).

Almost surely, 2^21426930424 is an apocalyptic number.

It is an amenable number.

21426930424 is an abundant number, since it is smaller than the sum of its proper divisors (22805756936).

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

21426930424 is a wasteful number, since it uses less digits than its factorization.

21426930424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37288 (or 37284 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

The spelling of 21426930424 in words is "twenty-one billion, four hundred twenty-six million, nine hundred thirty thousand, four hundred twenty-four".