21034432320 has 224 divisors, whose sum is σ = 72977020416. Its totient is φ = 5090764800.

The previous prime is 21034432301. The next prime is 21034432339. The reversal of 21034432320 is 2323443012.

It is an interprime number because it is at equal distance from previous prime (21034432301) and next prime (21034432339).

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 8309455 + ... + 8311985.

Almost surely, 2^21034432320 is an apocalyptic number.

21034432320 is a gapful number since it is divisible by the number (20) 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 21034432320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36488510208).

21034432320 is an abundant number, since it is smaller than the sum of its proper divisors (51942588096).

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

21034432320 is a wasteful number, since it uses less digits than its factorization.

21034432320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3349 (or 3339 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 21034432320 its reverse (2323443012), we get a palindrome (23357875332).

It can be divided in two parts, 21034 and 432320, that added together give a palindrome (453354).

The spelling of 21034432320 in words is "twenty-one billion, thirty-four million, four hundred thirty-two thousand, three hundred twenty".