21325540224 has 256 divisors, whose sum is σ = 61093512000. Its totient is φ = 6577127424.

The previous prime is 21325540183. The next prime is 21325540277. The reversal of 21325540224 is 42204552312.

It is a junction number, because it is equal to n+sod(n) for n = 21325540191 and 21325540200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30077982 + ... + 30078690.

Almost surely, 2^21325540224 is an apocalyptic number.

21325540224 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 21325540224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30546756000).

21325540224 is an abundant number, since it is smaller than the sum of its proper divisors (39767971776).

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

21325540224 is a wasteful number, since it uses less digits than its factorization.

21325540224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865 (or 853 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The spelling of 21325540224 in words is "twenty-one billion, three hundred twenty-five million, five hundred forty thousand, two hundred twenty-four".