21294835224 has 64 divisors (see below), whose sum is σ = 57421405440. Its totient is φ = 6542067840.

The previous prime is 21294835117. The next prime is 21294835259. The reversal of 21294835224 is 42253849212.

It is a super-2 number, since 2×21294835224² (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, 149119 + ... + 254609.

It is an arithmetic number, because the mean of its divisors is an integer number (897209460).

Almost surely, 2^21294835224 is an apocalyptic number.

21294835224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21294835224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28710702720).

21294835224 is an abundant number, since it is smaller than the sum of its proper divisors (36126570216).

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

21294835224 is a wasteful number, since it uses less digits than its factorization.

21294835224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106160 (or 106156 counting only the distinct ones).

The product of its digits is 276480, while the sum is 42.

The spelling of 21294835224 in words is "twenty-one billion, two hundred ninety-four million, eight hundred thirty-five thousand, two hundred twenty-four".