21250614424 has 64 divisors (see below), whose sum is σ = 43265658240. Its totient is φ = 9726912000.

The previous prime is 21250614389. The next prime is 21250614433. The reversal of 21250614424 is 42441605212.

It is a super-2 number, since 2×21250614424² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12261462 + ... + 12263194.

It is an arithmetic number, because the mean of its divisors is an integer number (676025910).

Almost surely, 2^21250614424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21250614424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21632829120).

21250614424 is an abundant number, since it is smaller than the sum of its proper divisors (22015043816).

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

21250614424 is a wasteful number, since it uses less digits than its factorization.

21250614424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2660 (or 2656 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

The spelling of 21250614424 in words is "twenty-one billion, two hundred fifty million, six hundred fourteen thousand, four hundred twenty-four".